Python phot function is now able to call pyraf successfully and obtain 
results.  They do not quite match up with those from the Perl script though 
(test case fails).  This may be due to the differences in how parameters
are specified and needs to be investigated further.
Maxcount and exptime are now optional parameters to phot.  Maxcount 
used instead of maxlin.  Test cases passing, though the delta on the 
magnitude error had to be relaxed a bit.  The Python code returns 0.291 
while the Perl code returns 0.290.
Merge branch 'phot' into gui