Updates for April 11

[bfhealy]

General announcements

• Users can now use the XGBoost algorithm to train binary classifiers on our training set.
• Feature generation can be run on user-specified fields in the config file.
• The latest ZTF_sources catalog is being reloaded onto melman to address an incomplete ingestion.

Pull requests

• Add XGBoost algorithm to scope #331
• Generate features for fields specified in config #334

Issues

• Test currently failing due to melman catalog maintenance #335

Going forward

We will add XGBoost inferencing to scope, troubleshoot installation issues for the AST 8581 class, and prepare for a Monday talk at the APS meeting.