extsync: more robust error-checking and correct options
rm obsolete symlink; use `apg` (external program) instead
rm gnome-keyring-cli: `secret-tool` from libsecret-tools provides the same functionality
rm prep_crypto: will merge equivalent functionality into luksblk (external program)
categorise some of the scripts in ops/
todo: more flexible search, allow omission of username
todo: add to core symlinks
git-objects: unpack into non-hidden directory and add a brief description