NXDRIVE-175: Don't use last modification time to detect remote changes, detect actual rename / move / content update instead
NXDRIVE-125: Handle docs under a sync root and in the Locally Edited collection (more generally in a synchronized collection)
NXDRIVE-153: Add xattr on files
NXDRIVE-165: Use utc everywhere
NXDRIVE-160: Add the file generator
NXDRIVE-153: Simplify the move detection