mod_substitute: No real functional change, but:
- define default for maximum line length
  indepenent of MAX_STRING_LEN
- Clarify line length check with a comment
- add supported 'b' suffix to directive
  description


git-svn-id: http://svn.apache.org/repos/asf/httpd/httpd/trunk@1631983 13f79535-47bb-0310-9956-ffa450edef68
Remove some backported item

git-svn-id: http://svn.apache.org/repos/asf/httpd/httpd/trunk@1632443 13f79535-47bb-0310-9956-ffa450edef68
Add how-to guide for OCSP Stapling

git-svn-id: http://svn.apache.org/repos/asf/httpd/httpd/trunk@1632454 13f79535-47bb-0310-9956-ffa450edef68