The following programs were used to investigate the effect of convolution upon
the variance maps.  They are designed to be used in series:
fake -> shift -> convolve -> significance -> phot
with the in-between steps optional.  The file names are hard-coded, so need to
be updated in order to change the path.  The final result is a comparison
between the actual significance of a source and the expected significance
(according to psphot).
