add test for MPI_WIN_MODEL attribute
cleanup test_win_model so it compiles and runs
Merge branch 'mpi3rma' of git.mpich.org:armci-mpi into mpi3rma

Conflicts:
	tests/test_parmci_lib.c
rewrite MPI_WIN_MODEL parsing since it may have been generating false positives before
disabled UNIFIED printout
fix dumb logic error
finally got the 'do not print unified' stuff right
make workaround for broken OMPI default
warn user when they try to use broken OMPI RMA dt
openmpi works without datatypes