Changes concering RFC 3820 (proxy certificates) integration:

 - Enforce that there should be no policy settings when the language
   is one of id-ppl-independent or id-ppl-inheritAll.
 - Add functionality to ssltest.c so that it can process proxy rights
   and check that they are set correctly.  Rights consist of ASCII
   letters, and the condition is a boolean expression that includes
   letters, parenthesis, &, | and ^.
 - Change the proxy certificate configurations so they get proxy
   rights that are understood by ssltest.c.
 - Add a script that tests proxy certificates with SSL operations.

Other changes:

 - Change the copyright end year in mkerr.pl.
 - make update.