mpiP v3.1.2 release

We are pleased to announce the release of version 3.1.2 of the mpiP lightweight profiling library for MPI applications.

Release v3.1.2 addresses the following issues:
* Better MPI support for Init_thread, Testany, Testsome, Waitany, and Waitsome.
* Improved support for linux-mips64.
* Added option to configure for generating weak Fortran symbols in the case of multiple Fortran mangling schemes in the application object files (--enable-fortranweak).
* Addressed various outstanding issues (see ChangeLog for more details).