[0.85] #4385: Factorizing in CommonDBRelation and check that checkboxed are checked in processMassiveAction


git-svn-id: https://forge.indepnet.net/svn/glpi/branches/0.85-work@21525 35612d4c-9d10-0410-837c-bf9dd1be60d7
[0.85] Allow selection per itemtype for massive action on Item_Devices


git-svn-id: https://forge.indepnet.net/svn/glpi/branches/0.85-work@21526 35612d4c-9d10-0410-837c-bf9dd1be60d7