Try to reduce confusion over multiple and possible "conflicting"

versions of the term "default" by changing AddDefaultCharset to
be of the mode Off | On | charset
PR:
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@84570 13f79535-47bb-0310-9956-ffa450edef68