Merge r563154, r563229, r563230 from trunk:

Don't try to compress/decompress where there's a Content-Range.
According to RFC2616, the range would have to apply *after*
applying content-encoding, so anything that's been set before
running the deflate filter is going to be broken.



* We already unset Content-Length in the inflate_out_filter. So move the
  comment and unsetting of Content-MD5 in the right place.


* Also unset Content-MD5 in the deflate_out_filter

Reviewed by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@563466 13f79535-47bb-0310-9956-ffa450edef68