`disp.rebase_reference` meta issue

[scottstanie]

Issue for tracking requests/bugs found during more large scale testing

@bbuzz31 @mgovorcin @mirzaees

Bugs

• nodata is incorrect for the average_ rasters of Uint8 data

Features

• Masking: allow a different mask to be computed and applied other than recommended_mask. A big reason is to incorporate the timeseries_inversion_residuals