Replaced ast_rtp_glue_register with ast_rtp_proto_register for asterisk 1.6

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4169 43c1dc8c-776e-4df2-8ef1-6e829299be21
Implemented sccp_wrapper_asterisk_set_channel_linkedid (replaced linkedid/updated cel_ref)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4170 43c1dc8c-776e-4df2-8ef1-6e829299be21
Fixed participant refcount for conference, so that it is cleaned up correctly after conference is over. Added linkedid to conference struct. Update linkedid's to the moderator channel whichs starts the conference

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4171 43c1dc8c-776e-4df2-8ef1-6e829299be21