Merge branch 'ht/mutator'

Merge branch 'ht/mutator'

* ht/mutator:
  Doc: Syntax of field references and mutator calls.
  Mutators for Catalog states.
  Doc: Removing last remains of non-pure functions in the kernel.
  Doc: Removing doc for non-pure function setbboxgroup.
  Doc: Removing doc for removed non-pure functions that were used to modify group states.
  Doc: Adding missing documenting of tack-on, peek, and freeze.
  Doc: Updating states that now use mutators.
  Mutators for Group and Group3D states.
  Doc: Formatting for mutators.
  Introducing mutators.
  Silly whitespace fix.
  Removed unused file.
  Updating example for compliance.

Conflicts:
	doc/parts/bindings/non-pure.sxml
	doc/parts/formats/language-elements-html.xsl
	doc/styles/html/shapes.css
	examples/applications/johan_lay.shape
	examples/features/random.shape
	source/Makefile.am
	source/value.h