Adding a new format
-------------------
*  Create fm_xxxx.cc having fm_xxxx()
*  Add fm_xxxx() into ../../include/sbsat_formats.h
*  Add function call to fm_xxxx() into read_input.cc function read_input (for input)
*  Add function call to fm_xxxx() into write_output.cc function write_output (for output)
*  Possibly fix getformat() in autochk.cc to autodetect the new format
