add link blocks and schemas to rel db
remove neo4j relics from tag
add missing author fks to schemas and blocks
update schema diagram
refactor gender out out user
add manyToMany support to annotation metadata
fix test environment
revert removed empty mappers

This partialy reverts commit 8a2dc0e0fbed1968c19e340c5a980270cc1717e2.
add support for arrays to annotation meta data
[test] add content model integration test
replace schema block MtM with blockLink entity