Add 'all' rule to Makefile
Handle multi-score files creating multi. midi's

The files are generated as name-1.midi, name-2.midi, etc., so this
handles moving all *.midi files into midi/
Beginnings of introduction to lit. book
Initial drafts of Cherubic hymn in E minor

Currently don't recall composer/arranger of this one, but know that it's
in E minor. The one that is currently done in Slavonic at our parish,
the goal here is to provide an English version that can be done
alongside it instead of a completely different (Byzantine) one that we
currently do.