* PCU_Tests_RAW.ttcn: add test case for UL link quality adaptation
* PCU_Tests_RAW.ttcn: introduce TC_ta_rach_imm_ass to test initial TA
* library/PCUIF_CodecPort.ttcn: strip padding bytes from PCUIF_data
* library/RLCMAC_CSN1_Types.ttcn: add UL Packet Resource Request
* Introduce PCUIF, BTS and ClckGen components for RAW PCU test cases