Added functions for TBF allocation, establishment, data transfer and release management.
Modified TBF structure, added list for several LLC PDUs in one TBF.
Added function gprs_rlcmac_tx_llc_pdus() providing transmission of several LLC PDUs in one TBF to MS.
this is probably a historic relict. None of them should be used, and I
cannot see any actual use of them either.
The only non-library code that we link now is libosmo-gb (ns/bssgp),
which soon will be turned into a real library.