Revert the portion of revision 6636 that caused caching headers to be sent.  It was not sending the headers when expected (for example, in checkouts), and Mike raised some concerns about correctness anyway.
Revert the portion of revision 6636 that caused caching headers to be
sent.  It was not sending the headers when expected (for example, in
checkouts), and Mike raised some concerns about correctness anyway.

See reopened issue #971 for details.

* subversion/mod_dav_svn/repos.c
  (dav_svn_set_headers): Don't send caching headers.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion