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Fix compiler warnings under OS X

This MR fixes a bunch of compiler warnings on OS X. It also removes the `MeshMove` extra utility, which seems to be very similar or identical to the one in `VortexWaveInteraction/utilities`. Should this not be the case, it can be restored in future from version control.

See merge request !382

Fix/user guide cpc

Some updates to the user guide in response to requests from CPC software library.

See merge request !383

Fix PETSc in serial

This MR fixes PETSc support when run in serial.

See merge request !381

Remove MoveMesh extra utility (seems to be the same as utility included in VortexWaveInteraction, still available in vc history)

Fix OS X CMake 3.0+ warnings

Fixes warnings on OS X under CMake v3.0.0+. For now this disables `MACOSX_RPATH`; once we reach a point where CMake 3.0.0 is the minimum required version we can patch our existing RPATH code to handle the new functionality.

See merge request !378

Merge branch 'feature/sponge-terminology' of gitlab.nektar.info:nektar into feature/sponge-terminology