[0.85] allow user to select the font used for PDF export

git-svn-id: https://forge.indepnet.net/svn/glpi/branches/0.85-work@21056 35612d4c-9d10-0410-837c-bf9dd1be60d7
[0.85] more fonts : DejaVuSans + cidfont

git-svn-id: https://forge.indepnet.net/svn/glpi/branches/0.85-work@21057 35612d4c-9d10-0410-837c-bf9dd1be60d7
[0.85] add addfont command to allow sysadmin to easily add more fonts

git-svn-id: https://forge.indepnet.net/svn/glpi/branches/0.85-work@21058 35612d4c-9d10-0410-837c-bf9dd1be60d7