New universal public key format.

Fix CRL+cert load problem in by_file.c

Make verify report errors when loading files or dirs

pages.

new DSA public key functions that were missing.

Also beginning of a cache for X509_EXTENSION structures: this will allow them
to be accessed more quickly for things like certificate chain verification...

and to lots of PEM_... functions.
Submitted by: Damien Miller <dmiller@ilogic.com.au>

Submitted by:
Reviewed by:
PR:

Also fix typos in the usage messages: "inout" instead of "input".