Added PJSIP patch to allow parsing of Allow-Events header

darcs-hash:20090717133527-58103-c075d5f73e1fea9c95d0d8091e1ea521ae577970
Better settings defaults and renamed back dialog_event

darcs-hash:20090718050224-58252-1ed0226b439286b9de12462ed5b89fef823685cf