Add docstring for WCS.has_distortion
Add Ellipse2D model
Add Ellipse2D model formula
Add test for Ellipse2D model
Add Ellipse2D example
Removed Ellipse2D __init__
Add changelog entry [skip ci]
Add machinery for SkyCoord to auto-search tables for appropriate columns
Use unit from Table column
revert SkyCoord initializer back to master
changed to guess_from_table classmethod
Add changelog entry
Fix accidentally left in exception
Fix case of double-specified error and add related tests
typo fix
Adapted @taldcroft's gist to guess_from_table
switch to not having a pluggable function
add RE-based parsing scheme for table names
update guess_from_table tests
Alter docstring a bit to reflect new scheme