Merge pull request #192 from chrispbradley/master

Small fixes for CellML and Gauss point based fields.
Merge pull request #193 from chrispbradley/master

Allow no material or fibre fields for CellML constituative laws and allow setting of MUMPS parameters on linked linear solvers
Adding better error messages for Mumps routines. Not finished.
Merge branch 'master' of https://github.com/OpenCMISS/cm
Switch over Gauss point fields so that Gauss point index is first and element index is second.