Reparse refactored expression before accepting it. And provide an error message when the expression is not syntactically correct
Refactorung bug fix
Updated design choices paragraph classification
Only try to cache elements which have a GUID
Removed variables from Message namespace
Removed unused Message.MESSAGE.Message structure (which was used to reference both incoming and outgoing EURORADIO messages)
Added a Bitfield field in all main structures
Bug fix for refactoring when a namespace was renamed
Merge pull request #440 from JamesOakey/OBTrackConditionsModelling

Ok, merged!!
Bug fix : the enclosing should not be set when passing a value to a function or procedure
The requirement tree node was not displayed when a rule condition was moved
Bug fix #321