Upgrading parmetis calls to use version 4.0
Setting up make file to use ParMetis 4 directory structure
Simple fix to the PARMETIS upgrade calls .. no need to modify code
Setting up Makefiles and switch to select version 4
More makefile modifications
modifications to cmake build system to pick up the correct ParMetis version and apply the required flags
Merge pull request #59 from OP2/feature/upgrade-parmetis-calls

Upgrade parmetis calls

Applies minor changes to the op_mpi_part_core.c and associated
Makefiles to enable OP2 to pick up and use ParMetis version 4 and over.

The CMake build has also been modified to support this.