ready-to-send at osmo-pcu

hi, while reading l1_if.c, i found it usefull to move the ready-to-send-req handling to gprs_rlcmac.cpp, because composing of data block (or idle blocks) should be done when they are about to be sent and not stored in a queue for the following reasons: - USF can be controlled close to the time when the block is transmitted. - acknowledged RLC would require that, it can react directly on acknowledgements and select the right packet. - LLC frames can be flushed by SGSN, so transmission stops immediately. - QoS / control blocks can be scheduled more adequate. for now, i think it is ok to keep the send-queue, but move it to gprs_rlcmac.cpp. later the queue should be obsolete, if segmentation is performed "just in time", as well as uplink control. a queue should be used for LLC frames _before_ segmentation. any complains/suggestions? if not, i would provide a patch for that. regards, andreas