* set proper flag when saving MS Timing Offset
* use gsm_subscriber's IMSI or lchan's name if bsc_subscriber is unknown
* add comments with spec reference
* store/display MS Timing Offset instead of raw Timing Offset field from
RSL
* Compute MS Timing Offset [-63; 192] from Timing Offset field [0; 255],
adjust structure gsm_meas_rep with proper type to store it
Change-Id: I7e003d23a6edb714c5f17688fd6a8edac131161d
Related: OS#1574
11e4e41ffc