Hunt group export use use transactions and check_str to cover single quotes in the name and description.

git-svn-id: http://fusionpbx.googlecode.com/svn/trunk@4606 e2954ef0-caed-11de-bd98-e341d93cc3cc
Add transaction support to ring_group_extensions.php and voicemail_export.php so that if there is an error that it rolls back the changes so the error can be corrected.

git-svn-id: http://fusionpbx.googlecode.com/svn/trunk@4607 e2954ef0-caed-11de-bd98-e341d93cc3cc