Permit to have quick frequency of RSS feeds  see #4611


git-svn-id: https://forge.indepnet.net/svn/glpi/trunk@22070 35612d4c-9d10-0410-837c-bf9dd1be60d7
slow query ticket / linked tickets see #4605


git-svn-id: https://forge.indepnet.net/svn/glpi/trunk@22073 35612d4c-9d10-0410-837c-bf9dd1be60d7
Priority with business rule on impact or urgency see #4495


git-svn-id: https://forge.indepnet.net/svn/glpi/trunk@22074 35612d4c-9d10-0410-837c-bf9dd1be60d7