Source Moments are assgned 0 values when fitting PSFs

[masiero]

The moments being passed to the Strail model (or any model for that matter) with
the "pmSource *source" call are being assigned 0 values. This becomes a problem
when I divide the Sx and Sy for the fitting parameters, as the values become
NaN.

I've traced the problem back to the values being fed in by the function
"pmSourceMoments", which I believe is coming from psModules11 -> objects ->
pmSource.c lines 624-625. I think just changing the PS_MAX comparision to go
from the calculated value to some number slightly greater than zero would fix
the problem.

I've developed a work around by adding a very small number to the input source
moments to prevent Divide-by-0 errors, but this seems like a dirty fix.

[eugene]

this issue has been long fixed.