Insert new header comment block, remove old one, manually improve file comments (defines / implements), change brief function description to doxygen format, remove some outcommented code

Insert new header comment block, remove old one, manually improve file comments (defines / implements), change brief function description to doxygen format, remove some outcommented code

Insert new header comment block, remove old one, manually improve file comments (defines / implements), change brief function description to doxygen format

manual editing of @brief ("defines ...", "implements ..."), removed multiple white lines

Conflicts:
	App/App.pro

App/App.pro simplified by using ROOT's root-config to determine ROOT's
installation directory; environment variable $ROOTSYS no longer needed;
we only request that $ROOTSYS/bin is in $PATH (otherwise root-config
won't be found)

Directory pub/core contains
- symbolic link to .cpp and .h files in Core/*/src and Core/*/inc
- configure.ac, Makefile.am, and files generated by autoreconf -if
Try ./configure; make; make install

TODO: check for external dependencies; no absolute path for python2.7

Conflicts:
	App/App.pro

Lattice2DIFParameter now is a class, InterferenceFunction2DLattice is protected against zero denominator, fix in project file to correctly treat FP exceptions under mac/linux