fixed bug in purgeHarvests SQL function (that had to do with deleted records maintaining a link to the harvested record they came from even after that harvest is passed). Also, am now not purging top-level harvest and ingestion information so that the information remains available for resources
finished (but not yet tested) script-generation for the JDBC metadata method
.gitignore
escaping ' characters in descriptions
updated TAP_schema-test-populate too