* BTS: refactor f_si3_has_gprs_indicator(): use SI3RestOctets
* library: clarify length restrictions for SI4 Rest Octets
* library: System Information: use RestOctets where possible
* library: get rid of Si1RestOctets and Si3RestOctets
* library: implement mandatory part of SI4 Rest Octets
* LAPDm_RAW_PT: Switch to dedicated channel without RACH+IMM.ASS
* bts: don't require users to pass test case name to f_init()
* bts: BTS_Tests_LAPDm.ttcn: rename f_init() to f_lapdm_init()
* bts: Remove one indent lvel from BTS_Tests_LAPDm.ttcn
* bts: Derive test component that talks RSL and LAPDm
* move lapdm/L1CTL_Test.ttcn to bts/BTS_Tests_LAPDm.ttcn