Bug #1057: New options to refresh-pattern configuration

Bug #1057: New options to refresh-pattern configuration

By Przemek Czerkas and David S. Madole

This is based on patch by David S. Madole
http://www.omdev.com/squid/squid-2.2.STABLE4.ignore-no-cache.patch

I've added more options to refresh-pattern configuration:

- 'ignore-no-cache' ignores any "Pragma: no-cache" and "Cache-control:
   no-cache" headers received from a server,

- 'ignore-private' ignores any "Cache-control: private" headers
   received from a server,

- 'ignore-auth' caches responses to requests with authorization
   irrespective of "Cache-control: " headers received from a server.

Warning - these options VIOLATE the HTTP standard!