This adds gdb pretty printers for a few objects such as TString and TNamed, as well
as a couple of RooFit objects. gdb can automatically load them if gdb's `add-auto-load-safe-path`
is set to ROOT's lib directory. `print /r <obj>` allows to still print raw.

changes needed to implement XROOTD as external package together with
the alien and monalisa plugins. I have also introduced a new option
(builtin_xrootd) to build XROOD together with ROOT.


git-svn-id: http://root.cern.ch/svn/root/trunk@42100 27541ba8-7e3a-0410-8455-c3a389f83636

- Removed the build of executable "drop_from_path"
- Added "-b" option to all tests that opens a X11 canvas
- Copy /etc, /icons, /fonts/ when running test from the binary directory


git-svn-id: http://root.cern.ch/svn/root/trunk@41634 27541ba8-7e3a-0410-8455-c3a389f83636

Introduce alternative cmake based build system. Cmake is especially convenient
for building on Windows, as it can produce VC projects or nmake files and 
does not require cygwin to be installed. In addition on OSX Xcode projects
can be generated.


git-svn-id: http://root.cern.ch/svn/root/trunk@39463 27541ba8-7e3a-0410-8455-c3a389f83636