This enhances what print_level can achieve in MGR. Particularly, now we can dump linear system info to files according to the print_level code. We also have the ability now of printing a sequence of linear systems to file (useful when hypre is used in time-stepping application).
A detailed list of changes is given below:
* Add utilities for creating/checking directories
* Add print_level codes to MGR and new info_path member
* Add hypre_MGRDataPrint
* Add call to hypre_MGRDataPrint and logic to update the print_level variable
* Update MGRSolve with new print_level logic
* Remove hypre_MGRWriteSolverParams
* Update documentation for HYPRE_MGRSetPrintLevel
* Implement new logic for HYPRE_MGR_PRINT_MODE_ASCII
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