=== sdrrSetStarttime ===

Snapshots merged sdrr msg file ahead to startTime, retains setup and FP-related msgs, separates setup msgs by delta
{{{
   Usage: sdrrSetStarttime sdrrfile [-s setupTime] -S startTime [-d setupMsgDelta]
     Creates new sdrrfile starting at "setupTime" or "startTime"
     FP related messages prior to startTime are retained (time is adjusted).
       -S startTime     : messages prior to startTime are time-adjusted
       -s setupTime     : (optional) if specified, sim msgs begin at setupTime and are separated by setupMsgDelta secs
       -d setupMsgDelta : (optional, defaults to 1sec) seconds inserted between retained messages prior to startTime
                          [note: setupMsgDelta is not applied unless setupTime is specified]
}}}
examples:
{{{
   CS-setup-prior-to-FPs:
   ----------------------
     sector:
       sdrrSetStarttime -s 12:45:10 -S 13:00:00 -d 00:00:02 sector.out > sector_setstart.out
       (note what time CS setup messages are 'done' and use that time (or later) as -s option for main/merge file)
     main/merge:
       sdrrSetStarttime -s 12:49:00 -S 13:00:00 -d 00:00:02 merge.out > merge_setstart.out
     then merge sector_setstart.out into merge_setstart.out at appropriate spot
}}}

{{{
   FPs-prior-to-CS-setup:
   ----------------------
     main/merge:
       sdrrSetStarttime -s 12:45:00 -S 13:00:00 -d 00:00:02 merge.out > merge_setstart.out
       (note what time setup messages are 'done' and use that time as -s option for sector commands)
     sector:
       sdrrSetStarttime -s 12:52:30 -S 13:00:00 -d 00:00:02 sector.out > sector_setstart.out 
     then merge sector_setstart.out into merge_setstart.out at appropriate spot
}}}