This will help programs that need to URL-escape strings.
Also, this changes `do_hvis()` to not fallback on `do_svis()` for chars in
`extra` -- that `do_hvis()` was doing that seems like an oversight. Christos
Zoulas, of NetBSD, agrees. `do_hvis()` still falls back on `do_svis()` for
characters not in the RFC 1808 / 3986 to-be-escaped set *and* characters not in
the `extra` set -- that much seems to have been the intent.
retroactively relicensing all code held under their copyright from a
4-clause 'traditional' BSD license to a new 3-clause 'revised' BSD
license, which removed the advertising clause.
From NetBSD, via Joel Baker, and Alistair G. Crooks
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@14612 ec53bebd-3082-4978-b11e-865c3cabbd6b
