removed all trailing whitespaces in all git files

Cleanup of all files, i.e. removed all white-spaces at the end of lines

See merge request !3

arh3 reader corrected, especially the parh reader part

Rewriting of some functions in the ARH3 reader, partitioned meshes are now read from the PARH files directly and all the information about partitions is extracted from the PARH file.

See merge request !2

Issue/functor expression args

Correct a bug in the functor expressions with variadic arguments, especially a bug in `traits/basic.hpp` when importing `boost::mpl` constants/classes.

See merge request !1