CHANGED db.php API so it doesn't append WHERE for you

CHANGED db.php API so it doesn't append WHERE for you
added messages.php
fixed db_printf() so it actually returns the generated string
run.php now clears the old template object if you return a different basename
run.php now accepts full urls in addition to basenames returned from scripts. UNTESTED
session.php now puts a 'wfpl_' prefix on table names
redirect() now uses an HTTP/1.0 header instead of 1.1