modules/presence: Changed delete_shtable function to check dialog's full tag set
	Changed delete_shtable to take subs_t pointer as parameter to compare dialog's full tag set before deleting
	This changes presence API and delete_shtable is exported function - only effected module is rls
modules/rls:  Edit to cater for changed presence API
	Presence API has changed - delete_shtable now takes subs_t pointer instead of str to_tag to compare full dialog tag set
Merge branch 'master' of ssh://git.sip-router.org/sip-router