core: Add MaxRanges directive to control the number of ranges permitted
before returning the entire resource, with a default limit of 200.

Set 'Accept-Ranges: none' in the case Ranges are being ignored with
MaxRanges none.

Backport of r1162584, r1162587, r1166282, r1166663 and r1166667 from
trunk resp. r1164894, r1164896, r1166612 and r1166772 from 2.2.x.

Proposed/Backported by: rjung
Reviewed by: wrowe, covener


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.0.x@1489917 13f79535-47bb-0310-9956-ffa450edef68