Add functionality to load colours of regions for Amira surfaces
Change Amira surface loading to put different regions in surf$Regions
Improve regex for colour extraction to deal with trailing comma
Remove outdated commented-out lines containing previous methods
Fix regex and add class assignment
Fix regex to deal with blue value in color spec being 1
deprecate plotneuron3d.simple (and remove plot3d.neuron method defined here)
Merge branch 'feature/surfcolours' of github.com:ajdm/AnalysisSuite into ajdm-feature/surfcolours

* 'feature/surfcolours' of github.com:ajdm/AnalysisSuite:
  Fix regex to deal with blue value in color spec being 1
  Fix regex and add class assignment
  Remove outdated commented-out lines containing previous methods
  Improve regex for colour extraction to deal with trailing comma
  Change Amira surface loading to put different regions in surf$Regions
  Add functionality to load colours of regions for Amira surfaces
change surface class to hxsurf (all lower case)