Scanner: always try to create the table (SQLite 'IF NOT EXISTs check')
Add 'move' methods in database files helper, with tests
Add a method to InotifyWatch to check if it's started
Add a 'scan_file' method to scanner
Add missing files (hasher, tesh_hasher) from ba2241a63443e307c30e7526aa2df6c3bc0d2b1a
First version of the central pathWatcher, not tested yet