Our two build systems can generate almost entirely a modulemap file laying out
one module per library. Due to some non-modular implementation in ROOT's core we
still need to treat some header files specially.

This patch appends modular header files to the modulemap while skipping the
predefined ones. Configure-make relates all headers that are installed in
$ROOTSYS/include to their library whereas relates only headers which are part of
library's dictionary.

Fix for ROOT-8046 -Python C++ class wrappers in cppyy do not report the proper name (preventing pickling)
Cope with the cases __cppname__ is not defined, try __name__ if failure.

Fix for ROOT-8046 -Python C++ class wrappers in cppyy do not report the proper name (preventing pickling)
Added new atrribute __cppname__ to hold the C++ full name of the class/namespace and use __name__ with only the class name. Ensure that __module__ contains a proper python scope for the class/namespace.
Pickle relies on concatenating __module__ + '.' + __name__ to get a loadable type.

- Doxygen
- Image
- Spell check
- change the help according to https://root.cern.ch/phpBB3/viewtopic.php?f=3&t=22547

A python thread has the GIL and is waiting for the ROOT lock.
Another Python thread has the ROOT lock and needs to print a Warning().
The latter will evoke a python call, waits for the GIL - deadlock.

As we cannot determine whether the Warning() thread has the ROOT lock
and as we can end up in this situation in a myriad ways, simply do not
risk requiring the GIL in ROOT-multi-threaded mode, by not passing
through the python message handler but through the default one of ROOT.

removed Factory.py/ChangeCallOriginalCrossValidate, added noOutput option to jsmva magic for testing purpose

JsMVA: TMVA's method rewriter; 'overloaded' methods: Factory::TrainAllMethods, Factory::Factory, Factory::BookMethods

align with ROOT default one.
Inlining of images in the notebooks also now take much less time.
This was probably due to the number of points the graphics system
uses to draw the contour of the big round markers.