Avoid duplicate code by combining the two CoordinateHelper classes into one (differences are minimal)
Use OrderedDict for reproducibility
Fix bug in order of coordinates
Implement get_coords_overlay
Added disclaimer
Fix grid visibility
Fix coordinate_range (didn't work correctly for images covering longitude=0)
Fix tick visibility option
Fix get_pixels_to_data_scales
Increase minimum padding for axis label
Don't show ticks in invalid WCS regions
When tick values are specified manually, default to dd:mm:ss formatting
Fix transformation in get_coords_overlay
Initial generated docs
Added API section
Basic docs
Tidied up CoordinateHelper API
Simplify rules for ticks options
Plot tick labels in display coordinates rather than data coordinates
Differentiate between data and pixel coordinates when plotting ticks and tick labels