Fix FORTRAN strings handling in MPI_File_[open | set_view]

[artpol84]

C and FORTRAN handle strings differently (see here and here).

• In C they are null-terminated
• In FORTRAN - arrays with known length (possibly padded with spaces at the end)

FORTRAN puts the hidden parameters with lengths at the end of the subroutine list. This needs to be considered in the F77 wrapper.
Open MPI handles this in the similar manner.

Way to reproduce:

• Use the following simple MPI-IO test
• On my platform with the current mpiP version I'm getting testfilenative as C binds two strings from MPI_File_open and MPI_File_set_view together because \0 is missing.
• With this fix the filename is correct.

NOTES:

• Initially discovered on a production-grade weather simulation code.
• This PR depends on preliminary refactoring for the Multi-Threading support #12, Fix callsites output #14 and Fix callsites output #14. Should be rebased/merged once mentioned PRs are in.

[artpol84]

@cchambreau I've rebased this one as well and dropped dependency from #14. Son once #13 is in we can rebase/merge this one.

[artpol84]

@cchambreau, rebased on top of #13