removed reference to REGAUSS as new
(#331)
removed extraneous check for negative weight values
(#331)
moved assert_raises tests into try/except block
(#331)
remove extraneous tests of weights, make convertMask return an ImageView
(#331)
removed gratuitious copy, make it return before
(#331)
more tests of weight / badpix for test_psfcorr.py
(#331)