Documentation of code and data in all branches)

[gabrielbodard]

Please could you either (a) add a few notes to either the Readme or the Wiki in the COACS repo explaining the structure of the files and directories currently in the SHL_ingest branch, or, if time doesn't permit, (b) explain it to Joanna and me sometime, so that we can do so. (For example, I was trying to find the latest version of the Marc records, and it isn't at all obvious to me where they are. A simple explanation of the directory names would presumably suffice.)

This will be essential for whoever takes over as developer for the Open Monograph phase of work next year, as well.

Merge branch back into Master as soon as current phase of development work is stable.