added checkradec to exposures.read_epochs and exposures.print_epochs to fix bug where images are requested that have not been copied to the epoch subdir
more fixes for epoch and filter cutting. refvisit now uses deepest visit by default for wcs reference image
reduced minobj of tweakreg since we have small images with faint objects
added shell script to run primo processing
Merge pull request #2 from drhay53/master

added checkradec to exposures.read_epochs and exposures.print_epochs to ...