Fixes to installation given that GOLUM is currently not conda installable. 
Additional documentation of new features
Documentation on contributing to Gravelamps

Adds Strong Lensing Model Selection method support
Adds Asimov v0.6 support
Preparation for LensingFlow Integration

O4 Reviewed Version, to be used in O4 running

Included here, are the build order overhauls which allow functioning conda recipe, the millilensing functionality updates including the discrete priors, and the asimov update to remove the race condition issue. 

This is the tentative Background Study version.

Mainline release following on from overhaul to interface