CORE-5065 Added MIGS Metadata Template.
CORE-5076 Added MIMS Metadata Template.
Fixed comment typo.
CORE-5082: added the ability to associate a single metadata attribute with multiple metadata templates
CORE-5083: added a table that can be used to mark metadata attributes as synonyms
CORE-5083: added an SQL function that can be used to list all of the synonyms for a metadata attribute, including transitive synonyms
CORE-5083: added some files that were missed in the last commit
CORE-5083: fixed a bug in the metadata_attribute_synonyms function