*.icc is used to define the templated part of some classes. These files only
make sense if they are included by the header whoose templates it defines.

In the context of ROOT at cmake configure time, cmake looks tries to compile
code (testing for available compiler features) using -fmodules and the ROOT
modulemap. It errors out saying the $ROOTSYS/include/GL folder doesn't exist
because move_headers target is not yet executed.

Make cannot deal with 'export *', they have to be escaped and fixed later on.

PyMVA: Introduce private local namespace so that multiple PyMVA methods in one factory can not interfere

- Doxygen format
- in group TMVA
- remove trailing spaces
- spell check

- Doxygen format
- in group TMVA
- remove trailing spaces
- spell check

This reverts commit 7ca0185a.

- math formula in latex: the original formulae were bad quality pictures. Some indices were hard to read. Authors need to cross check if they have been properly translated.
- Doxygen format
- in group TMVA
- remove trailing spaces
- spell check

- in group TMVA
- remove trailing spaces
- spell check

Spell check

In Python2, the dumps function of the json module always returns the
same JSON string for a given Python dictionary across different runs.
In Python3, the returned JSON changes across runs, in particular the
order in which dictionary keys are shown, which complicates the
notebook tests of the interactive neural networks. Only with a sorted
JSON we can compare the newly generated notebook with a reference notebook.

Fix Formula for missing parameters, ROOT-8182, e.g. TFormula(“f”,“[0]+[2]”) has now 3 parameters and not 2. The second parameter, “p1” is a ghost one.
This restores backward compatibility with old TFormula.
Add also a test

- in group TMVA
- remove trailing spaces
- remove TABs
- spell check
- math formula in latex
- add image

- in group TMVA
- remove trailing spaces
- remove TABs
- spell check
- math formula in latex

- in group TMVA
- remove trailing spaces
- spell check

- in group TMVA
- remove trailing spaces
- remove TABs
- spell check
- math formula in latex

- in group TMVA
- remove trailing spaces
- remove TABs
- spell check