MAJOR: Centralized naming of database files (db-*) in DatabaseRemoteFile (not yet complete), improved read performance of DatabaseDAO when loading headers only (skip chunks/multichunks/filecontents)
MINOR: Merge Fabrice's changes (more solid file history ID, operation covariance, xml dao int/long fix)
MINOR: TODO.md updates (links to relevant code / starting points)
MINOR: Change some TODO comments