Refactor mod_status out of the ExtendedStatus toggle picture, as other

modules can and should be able to use this scoreboard information.
Rename suggestions for such a directive are welcomed.

Note that mod_status toggles the default, to present the ExtendedStatus 
for server operators, whenever it is loaded.  Docs changes to follow.



git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@903020 13f79535-47bb-0310-9956-ffa450edef68