Make some changes to mod_browser:

Change BrowserCase to BrowserNoCase
Let per-server entries add, instead of override.
Add the ability to use !option to cancel a previously set option.

Reviewed by: Jim Jagielski


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@76738 13f79535-47bb-0310-9956-ffa450edef68