snapshot: expand usage a bit
snapshot: pull snapshot() to a sub
snapshot: disallow PREFIX=BACKUP to avoid clobbering backup
backup: moved ~/bin => install/root-files/usr/local/bin
backup: dont hardcode BACKUP as the prefix
backup: pull run("sync") out of makeSnapshot() and into backup()
backup: pull snapshot script into backup
install[sudoers]: dont hardcode conf dir
backup: note in the usage that PREFIX != BACKUP
backup: getLastBackupSnapshot => getLastSnapshot
backup: instead of sorting subvolumes, assert that they are already sorted
backup: pull getSnapshots() out of getLastSnapshot(), and check ALL prefix-named snapshots for existence
backup: add an option to delete subvolumes of the same prefix, leaving some number of snapshots
install[scriptscript]: hardcode home as /home/SUDO_USER when run as root
install[scriptscript]: replace all references to $HOME with getHome()
backup: remove undefined elements from subvolume lists
backup: add a sanity check to make sure at least one subvolume remains when deleting snapshots
fcrontab: snapshot => backup --snapshot
fcrontab: add jobs to cleanup snapshots
fcrontab: disable snapshot cleanup jobs