scif: Fix compile error related to r32196
Fix a cornercase with MPI_PROC_NULL persistent requests

Handle OMPI_REQUEST_NOOP in MPI_Startall rather than PML

cmr=v1.8.2:reviewer=bosilca:ticket=4764
Update git/hg ignore files
Fix use-mpi-trk/Makefile.am

Always include into the tarball (aka 'make dist') :
 - mpi-f90-interfaces.h
 - mpi-f90-cptr-interfaces.F90

cmr=v1.8.2:ticket=#4736