#71 add "gain" option to getps, getfs, etc

[Karen O'Neil]

It would be good to have the option for observers to
enter their own gain (or SEFD if you prefer) value for
the getps, getfs, etc. functions when the uniots of
"Jy" are chosen. This allows users to bypass the
theoretical gain value with their own, without the need
to run the "scale" function and then change the y-axis
title.

[Bob Garwood]

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Good suggestion. We will be talking about the calibration
model in the next development cycle and this sort of thing
is one part we've already thought some about.

For the moment, you could copy the appropriate .pro file to
your work area and edit that part of the code that does the
conversion to Jy to do whatever you think is more
appropriate. That happens in the helper function found in
all of the canned calibration routines (e.g. dopsint in
getps) and it should be pretty obvious in the code where
that happens.