Merge branch 'master' of https://github.com/OpenCMISS/cm into field_routines
Updating error messages for field_parameter_set interpolate xi routines.

Tracker Item 3299
Merge branch 'master' of https://github.com/OpenCMISS/cm into field_routines
Adding routine for getting line lengths from geometric fields

CMISSField_GeometricParametersElementLineLengthGet

Tracker Item 3545
Adding routine for getting/setting scale factors.

Tracker Item 3546
Merge branch 'field_routines' into TightCoupling

Tracker Item 2271