add MPI_Get_fortran_booleans and fix MPI_Set_fortran_booleans C API

[jeffhammond]

Problem

1. We discussed the need to MPI_Get_fortran_booleans in order to not use error codes to indicate something other than an error.
2. MPI_Set_fortran_booleans need to pass the logical values by pointer. It should be void* not int* but I haven't figured out how to do that in the binding generator yet.

Proposal

See https://github.com/mpi-forum/mpi-standard/pull/1046

Changes to the Text

See https://github.com/mpi-forum/mpi-standard/pull/1046

Impact on Implementations

Pass by value would be incorrect for LOGICAL*8 and wider.

Impact on Users

API works correctly.

References and Pull Requests

TODO