Bug fix #357
When closing the window, only ask once if one wants to save the file (this was due to the side effect of the Close() call)
Bug fix
Check comments for all ICommentables
Only consider elements from model that require a comment
Bug fix #374
Allow to delete a reference to a requirement
Bug fix : allow to handle statements such as (FIRST IN collection).Location <- Value
Bug fix #380 : Comments are not required
  - when there is only on rule in a procedure,
  - when there is only one rule condition in a rule
Bug fix #355
Bug fix #361
Bug fix #350
§3.4.4.2.3 is split.
Revision of info messages (more comments).
Merge branch 'OpenETCS/master'

Conflicts:
	ErtmsFormalSpecs/doc/specs/subset-026/BTM.efs_ns