Document how to reprocess a set of files in a test environment

[awhoward]

This should go in Read the Docs.

Components to document:

• Select observations using Jump and write to a .csv.
• Copy desired files from /data to an appropriate /testdata.
• Modify .config file(s) to use /testdata.
• Run DRP.

Plan: @awhoward will write the text in Read the Docs. @bjfultn will review it. @shalverson will be the guinea pig and test it.

[awhoward]

Add:

• Set up masters database environment variables and get log in.