SMS support for osmocombb

hi, i just finished SMS support for osmocombb. everything is committed in my jolly/testing branch. in order to support SMS, i extracted the SMS transcoding from openbsc. (jolly/sms branch) the SMC and SMR layer protocols are extracted and rewritten and use messages between layers and have state machines. they are added to libosmocore also. (jolly/sms branch) openbsc (jolly/sms branch) now uses the SMS layers and transcoding of libosmocore. LAPDm now supports correct handling of SAPI 3 datalink, especially on SACCH. the mobility management and radio ressource layers of osmocombb now support MM connections with SAPI 3. i have tested it on test BTS setup only, so feel free to run it and report bugs. regards, andreas