Some follow-ups to r1030536, mostly to fix a bug which caused access to be incorrectly denied in certain configurations.
Some follow-ups to r1030536, mostly to fix a bug which caused access
to be incorrectly denied in certain configurations.

* subversion/mod_authz_svn/mod_authz_svn.c
  (AuthzSVNAccessFile_cmd, AuthzSVNReposRelativeAccessFile_cmd): Tweak
    error message string.
  (subreq_bypass): Correct a conditional which was causing perfect
    good configurations to deny access to everything.
  (access_checker, check_user_id, auth_checker): Apply DeMorgan to
    visually group the "has a configured access file" checks.

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