Simmer

Bug fixes:
- Fix string bug in computing contrast curves.

Misc.:
- Add / fix links in docs
- Add some documentation and warnings to the contrast code.

Bug fixes:

- Stack skies / create images correctly

Misc.:
- Simplify plotting schema

Major additions:
- compute contrast curves

Bug fixes:
- allow mixed-case methods
- fix .xlsx reader

Misc.
- bump pandas from 1.1.4 to 1.2.3

- Allow search box size to vary
- Restrict scipy and astropy versions more carefully
- General plotting fixes
- Only reduce stars in config file
- Debug wide binary mode
- Debug usage of explicit skies

- Include docs and testing requirements in distribution
- Restrict matplotlib version