In general, chown is risky business.  On most systems it can only be
done as root.  Even riskier is chowning a file in a directory that is
already owned by a non-privileged user, because (depending on kernel,
system configuration, filesystem boundaries, etc) it's possible that
the non-privileged user could control the file pointed to, and the
superuser accidentally chowns a file they didn't intend.

Attacks here are often racy (TOCTOU) and subtly depend on interactions
with other system parts (e.g. gaining r/w control over a specific file
in /var/lib/dpkg/ or /var/lib/).  Better to avoid these risks entirely
where possible.

These conversion utilities only support RSA, and they're not widely
used outside the monkeysphere project.

As of now, the monkeysphere development branch doesn't even need them,
so we can drop them entirely.