Rename the common mod_dav_svn error creation function to declare that it
makes Subversion specific errors. Also remove two arguments that must remain
constant in order not to break libsvn_ra_neon compatibility.

* subversion/mod_dav_svn/dav_svn.h
  (dav_svn__new_error_tag): Rename to ...
  (dav_svn__new_error_svn): ... this and remove tag specifiers as they must
    remain constant anyway (at least without client knowledge).

* subversion/mod_dav_svn/reports/deleted-rev.c
* subversion/mod_dav_svn/reports/file-revs.c
* subversion/mod_dav_svn/reports/get-location-segments.c
* subversion/mod_dav_svn/reports/get-locations.c
* subversion/mod_dav_svn/reports/inherited-props.c
* subversion/mod_dav_svn/reports/log.c
* subversion/mod_dav_svn/reports/mergeinfo.c
* subversion/mod_dav_svn/reports/replay.c
* subversion/mod_dav_svn/reports/update.c
* subversion/mod_dav_svn/repos.c
* subversion/mod_dav_svn/util.c
* subversion/mod_dav_svn/version.c
  Update all usages. Removing final '.' from errors when applicable.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1553859 13f79535-47bb-0310-9956-ffa450edef68