Add a callback to the gsm_network. When updating the location and
assigning a new tmsi callback into the bsc_hack.c and have a queue
of mobile stations to page, allocate a channel for and ultimately
dial.
* initialize OML and RSL based on TEI establish (ACTIVATE_IND) events
* fix abis_nm_raw_msg() to not overwrite the OML header with payload
* fix debug print statements
* fix msgb_dequeue: actually dequeue it from the list ;)