ConvertPubKey: show DSA prime divisor bit size
ConvertPubKey: show DSA prime divisor bit size

When in verbose mode (e.g. --verbose and/or --check), show the size of
the DSA prime divisor (q) in bits.  Additionally emit warnings about this
size consistent with NIST 800-57 recommendations if it's too small.

mackyle/ezcert,mackyle/ezcert