Rssmospipeline

Release Summary
* Added ``-m`` command line argument that allows for a user-specified wavelength calibration arc model directory
* Fixes for no-flats handling (should now be consistent across both MOS and longslit data)
* Added longslit test cases

What's Changed
* Dev by mattyowl in https://github.com/mattyowl/RSSMOSPipeline/pull/29


**Full Changelog**: https://github.com/mattyowl/RSSMOSPipeline/compare/0.5.0...0.6.0

Release Summary
* Adds options for user-defined slit locations and skipping flat fields (contributed by Melissa Morris)
* Tests and doc updates
* Bug fixes

What's Changed
* User defined slit locations and skipping flats by mattyowl in https://github.com/mattyowl/RSSMOSPipeline/pull/23
* pass noFlat args to cutIntoSlitLets by melissamor in https://github.com/mattyowl/RSSMOSPipeline/pull/25
* Tests and docs by mattyowl in https://github.com/mattyowl/RSSMOSPipeline/pull/26

New Contributors
* melissamor made their first contribution in https://github.com/mattyowl/RSSMOSPipeline/pull/25

**Full Changelog**: https://github.com/mattyowl/RSSMOSPipeline/compare/0.4.0...0.5.0

More robust handling of chip gap masking and flat fielding.

Adds rss_mos_visual_inspector, a GUI tool for plotting spectra, overlaying templates, and measuring redshifts

Various bug fixes and some new arc models