
we have several output formats:
  - TEXT : separate ASCII tables for PSF, EXT, MNT, and NULL
  - SX : sextractor-style ASCII file
  - OBJ : dophot-style ASCII file
  - CMP : old-style elixir format (header + text)
  - CMF : fits-table

we have several options for organization:
  - single chip/readout : outroot.ext
  - split chips : outroot.NN.ext
  - mef chips : outroot.ext (extensions with names)

  * only CMF will work with MEF model

