PetscErrorCode PetscSharedWorkingDirectory(MPI_Comm comm,PetscBool *shared)Collective
| comm | - MPI_Communicator that may share working directory | 
| shared | - PETSC_TRUE or PETSC_FALSE | 
| -shared_working_directory | - indicates the directory is shared among the MPI ranks | |
| -not_shared_working_directory | - indicates the directory is shared among the MPI ranks | 
| PETSC_SHARED_WORKING_DIRECTORY | - indicates the directory is shared among the MPI ranks | |
| PETSC_NOT_SHARED_WORKING_DIRECTORY | - indicates the directory is shared among the MPI ranks | 
Assumes that all processors in a communicator either 1) have a common working directory or 2) each has a separate working directory eventually we can write a fancier one that determines which processors share a common working directory.
This will be very slow on runs with a large number of processors since it requires O(p*p) file opens.