[daip] feature in GETJY

[Claire Chandler]

As far as I can tell, GETJY still uses ANTENNAS listed as negative for
deriving source fluxes, rather than ignoring those antennas as one might
hope.  At least, I get the same values for source fluxes whether I set
ANTENNAS 0 or ANTENNAS -8 (to ignore antenna 8), whereas I get different
source fluxes if I go ahead and specify all the antennas except antenna 8.

Claire