Merge tag 'server-v0.7.4' into develop

Tag for server v0.7.4
refactor phony layer transform to handle all phonies equivalently, including annotations
adjust priority order for annotations
add an optional tei:idno to annotation documents
first pass at annotation support in combine transform, old tests pass, new tests not yet added
allow a file to have no dependencies
convert all remaining xml:id to jf:id in the resolve stage
annotation docs are transformable
basic annotations and tests
Initial draft of tehillim.css and addition of reset.css.
annotations for parallel documents
handle annotations with broken up hierarchies
Merge branch 'feature/annotation-support' into develop

Closes #126, closes #127 and closes #128
Merge https://github.com/opensiddur/opensiddur into feature/CSS
Updated generic.xml to reflect CSS written in tehillim.css.
validate a document only when its license URL is in a limited set, fixes #130
remove availability/@status from schema
remove @status from template
remove @status from existing docs during upgrades
remove lots of old/unused code