First draft for the requirement sets
Renamed functional block to requirement set
Allow to have recursive RequirementSets
Added the scope information to requirement sets
Displayed the tested coverage for each requirement set
Renamed obsolete fields and modified the code accordingly
RequirementSets continued
  - Added a default implementation status for paragraphs belonging to the requirement set
  - Allow to select requirements which do not belong to the requirement set
  - Update specification window when a new requirement set is added (through drag & drop) to the paragraph
  - Display fields related to requirement set
Added a please wait message when building big box arrow diagrams
Requirement sets continued
  - Indicates when a requirement set could not be set for a paragraph.
  - Keep the position of the boxes when it has been set
  - Remove useless "" in RTF box initialization

This completes bug fix #326
Release 1.0.16
Allow to rename a requirement set.
Removed requirement sets from comparison operation because there is a chicken & egg problem with it :
  - when loading a file without requirement sets, one wants to automatically create the requirement set to compare with
  - but the guid should match the one of the existing requirement set
  - which cannot be deduced at that step
  - the the guid is required to be able to create requirement set reference...