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

Putting it to "NO" made the list of methods for each class very long and very confusing.
The inherited methods and members are now sorted in "shutters" according to the class defining them

- TSpectrum.cxx now refers to the new examples.
- Remove useless pictures.

- remove white space

- Until now the rule for the tutorials was that the \author line must be the last one of the tutorial header. Recently the multicore tutorials
have an extra line "\date" after the \author one. Now the filter does not expect that \author is the last line. It simply consider as "header"
all the lines starting with /// before the macro code.

- Typos