Settings for starting blat servers

translated server:
   gfServer start blatX 17778 -trans -mask -log=trans.log *.2bit
untranslated server:
   gfServer start blatX 17779 -log=untrans.log *.2bit
untranslated server plus PCR server:
   gfServer start blatX 17779 -stepSize=5 -log=untrans.log *.2bit