Many tests fail with the latest astroscrappy release

[mwcraig]

For example, test_cosmicray_gain_correct fails with:

E   TypeError: detect_cosmics() got an unexpected keyword argument 'pssl'

[saimn]

Oops, yeah several parameters have been renamed. I can have later if you want.

[mwcraig]

Oops, yeah several parameters have been renamed. I can have later if you want.

That would be excellent -- if you can point me some documentation (or commit) that has the renames I do have plenty of time today to work on this.

[saimn]

The changes come from astropy/astroscrappy#53, which allow to properly manage the background for spectroscopy. So data should now include the background. And some keywords were renamed for consistency.