Replace all occurrences of strlen(x) == 0 with !x[0] which is far cheaper for long strings.

git-svn-id: http://root.cern.ch/svn/root/trunk@49072 27541ba8-7e3a-0410-8455-c3a389f83636

The attached patchset fixes a bunch of typo in the source:
0001-succes-success.patch
0002-preceed-preced.patch
0003-informations-information.patch
0004-childs-children.patch
0005-avaliable-available.patch
0006-writeable-writable.patch
0007-comand-command.patch
0008-unkown-unknown.patch
0009-wierd-weird.patch
0010-wheter-whether.patch
0011-unecessary-unnecessary.patch
0012-splitted-split.patch
0013-registerd-registered.patch
0014-recieve-receive.patch
0015-processsing-processing.patch
0016-ouput-output.patch
0017-mutiple-multiple.patch
0018-lenght-length.patch
0019-interupted-interrupted.patch
0020-independant-independent.patch
0021-inconsistant-inconsistent.patch
0022-expresion-expression.patch
0023-explicitely-explicitly.patch
0024-enviroment-environment.patch
0025-deafult-default.patch
0026-continous-continuous.patch
0027-completly-completely.patch
0028-commited-committed.patch
0029-choosen-chosen.patch
0030-backgroud-background.patch
0031-auxilliary-auxiliary.patch
0032-authentification-authentication.patch
0033-appropiate-appropriate.patch
0034-an-other-another.patch
0035-environement-environment.patch
0036-targetting-targeting.patch
0037-suppported-supported.patch
0038-paramater-parameter.patch


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In file included from input_line_1411:1:
/local2/pcanal/cint_working/rootcling/root.untouched/include/Math/Derivator.h:224:8: error: cannot combine with previous 'int' declaration specifier
   int Status() const; 
       ^
/usr/include/X11/Xlib.h:90:16: note: expanded from macro 'Status'
#define Status int
               ^


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- remove trailing blanks


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These are used for view panning and camera fwd/bkwd movement.


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but this is wrong, if something changes in TGLWSIncludes.h, all cocoa related code will be silently
excluded.


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scaled coordinate system within GL windows. We use full resolution in GL while
GUI and window system work in points that are 2x2 pixels.


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- EOverlap is now in namespace Rgl;
- EClipType is now in class TGLClip;
- EPosition and EManipType were not used and have been removed.

EGLCoordType and EGLPlotType are left in top-level. In these two enums all
names begin with kGL so there is less chance for collision.


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  Add function Bool_t IsScalingForRender() that returns true if length of base
  vectors is significantly different than unity.

* TGLPhysicalShape:
  Cache state of fTransform.IsScalingForRender() in a bool member.
  When this is true, enable automatic scaling of normals during rendering.

* TGLLogicalShape:
  Add static Bool_t fgIgnoreSizeForCameraInterest allowing a user to prevent
  RGL from hiding very small objects - at least a pixel is always drawn. One
  should invoke:
    TGLLogicalShape::SetIgnoreSizeForCameraInterest(kTRUE);


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native Cocoa backend will be build by default. To build X11 backend, install
XQuartz and configure with ./configure --disable-cocoa. On OSX < 10.8 X11
backend is still default and Cocoa backend can be build using the 
--enable-cocoa configure flag.


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on Mac gluNewQuadric fails.


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to using back-buffer. This can be disabled via the following rootrc setting:
  OpenGL.SavePictureFallbackToBB: off

Latest SLC5, SLC6 intel/mesa drivers seem to be good at lying that they
support FBOs and then flipping backwards once you ask them to cough up one.


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  Add function:
    TGLViewer::ReinitializeCurrentCamera(TGLVector3 fwd, TGLVector3 up);
  allowing the user to setup a non-standard camera base.


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standard (up-direction fixed) and arc-ball rotation modes.

* TGLCamera
  Add functions RotateArcBall() and RotateArcBallRad().
  Add member 'Bool_t fWasArBalled'. Check its state in standard Rotate
  function and fix up direction if needed.

* TGLOrthoCamera, TGLPerspectiveCamera
  Use combined view matrix's third vector as the up direction.

* TGLEventHandler
  Add arc-ball state variable and key-handling.
  Add logic for calling std vs arc-ball camera rotate function.

* TGLSAViewer
  Document arc-ball key binding in help text.


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  using namespace std;
from Riostream.h, which has huge consequences for all of ROOT.
Riostream.h is now a simple wrapper for fstream, iostream, iomanip for backward compatibility; Riosfwd.h simply wraps iosfwd.

Because of templates and their inline functions, Riostream.h needed to be included in headers, too (e.g. TParameter.h), which violated the assumption that Riostream.h is not exposing its using namespace std to headers.
ROOT now requires R__ANSISTREAM, R__SSTREAM, which does not change the set of supported compilers.

Without "using namespace std", several identifiers are now prefixed by std::; e.g. roofit/* source files now have a using namespace std to keep their coding style.
TFile::MakeProject() now generates "using namespace std" to convert the CINT-style class names into C++ ones.


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2. Add some methods to ROOTOpenGLView (not to have exception on non-existing selector).


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Implement CreateOpenGLContext. For the moment, I have 1 to 1 relation between GL view and GL context
(and it looks like we never create several GL context for 1 TGLWidget).


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TGLWidget and TGLContext classes were designed to isolate gl-context/gl-window specific code inside gl module.
Unfortunately, this isolation is bad as soon as we have to work with Obj-C, OpenGL, classes from Cocoa module.
TGLFormat can not go to core/base (because of multi-sampling part of code), I have to convert format into something,
I can pass to gVirtualX - array of pairs (enumerator-value).


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Thanks to Matevz, all system headers are hidden so I can smoothly switch between
different GL implementation without need to modify code, no changes are needed in glew/ftgl/eve at all.


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this patch should filter G__* from the sources.


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missing check for zero-size name-stack size. So, hovering over an axis or
camera center sphere resulted in a crash.

* TGLSelectBuffer - return name-stack size from Set() method.
* TGLViewerBase - check name-stack size before accessing elements.
* TGLViewer - do not draw non-scene objects in rendering for selection.


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