Add automatic generated fortran support for setting and returning contexts

Major cleanup of the code for setting and returning application (previously called user) contexts
- PetscCtx ctx is now t

Add automatic generated fortran support for setting and returning contexts

Major cleanup of the code for setting and returning application (previously called user) contexts
- PetscCtx ctx is now the standard for passing in contexts
- PetscCtxRt ctx is the standard for passing out contexts, including context destroy routines based on PetscCtxDestroyFn

Both of these are typedef to void*

Also removed most use of user and userctx for context arguments now consistently named ctx

Improved documentation on PetscCtx and PetscCtxRt and on how to use contexts (including getting them) from Fortran

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Merge remote-tracking branch 'origin/release'

Fix a race condition in PCMPISolve() when using Unix shared memory.

The 0th rank accesses the solution of the other rocesses before the other processes have finished updating the final solution loca

Fix a race condition in PCMPISolve() when using Unix shared memory.

The 0th rank accesses the solution of the other rocesses before the other processes have finished updating the final solution locally. This cannot happen with the MPI communication based version because the communication is done with an MPI_Allgatherv() that blocks on the processes getting to that point before copying over the data.

Reported-by: Marsha Berger

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