first draft: PRE functionality-merge. runs at uw
give flux normalization its own method. More nan safe
fix normalize flux method to loop over self.warpedExp.keys()
First cut.
Bug fixes to imageDifference.py and updates for enhanced mapper.
Persist the matched exposure (requires ip_diffIm tickets/2317).
Call ImagePsfMatchTask.subtractExposures instead of .run
Make detection bipolar by default.
Re-add deblend task (use current meas_algorithms).
Fix two bugs: subtractedRes->subtractRes and coadd not being set to EDGE before extraction
so if any pieces are missing they become 0
Added missing getMaskedImage call.
Add command line option for Psf FWHM, and swapping which image gets convolved (deconvolution)
Minor change to field name; do not implement, need ip_diffim ticket to really debug this.
Add star selector to imageDifference
Starselector bug fixes
Fix star selector
Select stars using science exposure. Send soruces to ip_diffim.
Removed debugging statement
Core background matching files added.
Add refid to argumentParser
iadded _makeDataRefList, not sure yet if its necessary.
added initial basic matching method - cheb poly fit