Fixes #3637: Move VT v5.14.4.2 changes to v1.7

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r28616 [[BR]]
attempt to fix #3627: Pass all configure options from the OMPI top-level configure to the OTF sub-configure

r28624 [[BR]]
Changes to VT: Fixed infinite recursion bug if the verbosity level (env. VT_VERBOSE) is higher or equal to 2
Fixes #3634: Move r28621 to v1.7 branch

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r28621 [[BR]]
Per https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/256, we need
to set *flag=1 when source == MPI_PROC_NULL.