Photometric calibration of UJ1.2

1) Generate DGMPHD/ujXXXX.phd files from ubv/dgm/phcal

2) Generate catalog by PIECE12+PIECE3+PIECE4.  PIECE4 generates
   DGMPHD/p4pairs.*

3) Use postproc/magreform to generate DGMPHD/p4sort.* from DGMPHD/p4pairs.*

4) Use postproc/iterate to generate DGMPHD/delta.mag

5) mv DGMPHD to DGMPHA and mkdir DGMPHD

6) Use postproc/magapply to generate the new DGMPHD/ujXXXX.phd files

7) Generate revised catalog using PIECE12+PIECE3+PIECE4
