#1545 Patch: enable GCC to parse Fortran warnings

[Federico Perini]

This patch proposes to enable parsing of Fortran input files from any GCC compilers.

It requires enabling multi-line output parsing, and a couple more regex formulas.

Posting here as a patch as recently suggested in the C::B forums, because it is not FortranProject-specific.

It is useful because most C/C++/Fortran projects these days use the standard gcc/g++ frontends rather than the "Gnu Fortran compiler" one that is valid for Fortran only.

Thank you,
Federico

[Federico Perini]

Sorry I meant "parsing Fortran-related compiler warnings", not "parsing Fortran input files".