Add a migration script to PloneMeeting 1.5

[gbastien]

Some changes will need to be adapted from PloneMeeting? 1.4

• The "enableColorSystem" field has been renamed to "itemColorization" : set "itemColorization" to "modification_color" if "enableColorSystem" was "True", set it to "no_color" either. Then delete the old "enableColorSystem" attribute... --> ALREADY DONE IN MIGRATION TO 1.4???
  

• add the "Advices" action tab on every MeetingItem? portal_types --> OK
  

• in config.py/ploneMeetingUpdaters we removed 'Member' role to correct ticket #607. We now have to walk every meetingConfigFolders to set the 'ATContentTypes: Add File' permission correctly to the new ploneMeetingUpdaters list defined. --> OK
  
• add "itemsInCopy" and a "itemstoadvice" searches in portlet_meetingitems to open the new items in copy functionnality --> OK
  

• run UpdateSecuritySettings? from portal_workflow to update security for new roles and permissions --> OK
  
• check that new indexes are correctly added... --> OK
  
• update existing topics --> OK
  

[gbastien]

"itemColorization" has been finaly called "usedColorSystem" ;-)

[sgeulette]

change french title or created groups: replace suffix 'modérateurs' by 'validateurs', 'aviseur' by 'émetteurs d'avis', 'observeurs' par 'observateurs'