fortran: fix MPI_Win_allocate_shared and MPI_Win_shared_query

Several problems with MPI_Win_allocate_shared and MPI_Win_shared_query
were discovered in a code review.  This commit fixes them:

* Add _cptr versions of both subroutines in mpif-h, use-mpi-tkr, and
  use-mpi-ignore-tkr directories
* Fix case of PMPI weak symbols for both C implementations
* Add MPI and PMPI f08 implementations of both subroutines (there is
  no _cptr version in the mpi_f08 module)
* Fixed _f08 suffix on the f08 module of both subroutines

cmr=v1.8.2:ticket=#4736
Opal: add a new MCA parameter that allows the user to specify a list of environment variables. This parameter will become the standard mechanism by which environment variables are set for OMPI applications replacing the -x option.   

mpirun ... -x env_foo1=val1 -x env_foo2 -x env_foo3=val3  should now be expressed as

mpirun ... -mca mca_base_env_list env_foo1=val1+env_foo2+env_foo3=val3. 

The motivation for doing this is so that a list of environment variables may be set via standard MCA mechanisms such as mca parameter files, amca lists, etc. 

This feature was developed by Elena Shipunova and was reviewed by Josh Ladd.