It avoid to execute "option" treatement code in case the option is "".

We use the math functions in the std namespace, so math.h was wrong here.

* coverity bugfix 93580: parameters for day montha year were in wrong order

* coverity 94012: removed redundant unreachable return statement

* coverity 82573: fixed copy paste error fXaxis to fZaxis

* Coverity 82274: fixed uninitialised class members

* coverity 94049: class member not initialised

* Coverity 94053: fixed uninitialised class members

* 4 coverity bugfixes

* coverity fixes: 63257, 62811, 62809, 62773, 62332, 62321

* coverity bugfixes: 62314,61873,61615,61605,61599,61590,61554

* fixed missing initialisation of fModelFunction ptr

* coverity 68080: 2 uninitialised class members

* coverity 68081 and 68084: several uninitialised class members

* coverity 68087 and 68086: uninitialised pointers

* coverity bug: uninitialised pointer

* coverity 82584,82583,82582,82581,82580,82579

* coverity 82578

* Coverity 68966: truncated return value in mixmax

* coverity 82576,82575

* coverity 68746,68745

* coverity 68958,68853,68852,68849

*  coverity 68860,68857

* coverity 68855

* coverity 68962

* coverity 68958

*  coverity 68731,68730,68729

* coverity 68959

* coverity 68856

* coverity 68080

* coverity 68083

* coverity 68079,68078,68077

* coverity 68749

* reverting to original version of llvm code

Make SetLimits available from the TAxis GUI context menu as requested here: https://sft.its.cern.ch/jira/browse/ROOT-8707

- option LEGO0 behaved a bit differently since Fix https://sft.its.cern.ch/jira/browse/ROOT-8582 was fixed. Some adjustment was required for the 3D frame drawing with option l3d.
- Change examples to use "auto" and remove useless returns

For backwards compatibility

Introduces a new templated WrappedMultiTF1 class and templates all of the the abstract classes it depends on.
Necessary for templating on different vectorization backends and types.

With this we avoid the need to build an std::function from free
functions to pass it as an argument to WrappedMultiTF1Templ

Handle properly the TH3 histograms with negative bin content when drawn as 3D boxes. (https://sft.its.cern.ch/jira/browse/ROOT-8581)

To get rid of tiny gaps in iso-lines drawing  on top surface of the frame I’ve
introduced new method TPainter3dAlgorithms::DrawLevelLines()
that draws iso-lines without applying hidden line removal.

In addition declaration of methods in TPainter3dAlgorithms.h have been
partially regrouped to have better structure of the class definition. Some
methods are now declared as protected.

Apply fix for ROOT-8567 also for Profile histograms. Do nothing in TProfile::LabelDeflate when not needed, i.e. when last bin containing the label is the last bin.

Fix ROOT-8303. Handle special characters (such as ^,@ or predefined-functions characters) in parameter names.

TAxisConfig construction was ambiguous due to too many constructor
overloads. Instead of constructing a TAxisConfig from a TAxisEquidistant etc,
allow the latter to convert to the former. This also gets rid of TAxisConfig's
init_list ctors.