Log Message:
Update subversion to 1.8.1.

Version 1.8.1
(23 July 2013, from /branches/1.8.x)
http://svn.apache.org/repos/asf/subversion/tags/1.8.1

 User-visible changes:
  - Client- and server-side bugfixes:
    * translation updates for German and Simplified Chinese
    * improve sqlite error message output (r1497804)
    * support platforms lacking mmap (r1498136)
    * allow configuration files to start with UTF-8 BOM (r1499100 et al)
    * don't fail on UTF-8 data when encoding conversion not available (r1503009)
    * improve error messages when encoding conversion fails (r1503010)

  - Client-side bugfixes:
    * merge: rename 'automatic merge' to 'complete merge' (r1491432)
    * mergeinfo: reduce network usage for '--show-revs' (r1492005)
    * ra_serf: improve http status handling (r1495104)
    * merge: avoid unneeded ra session (r1493475)
    * merge: reduce network usage (r1478987)
    * merge: remove duplicated ancestry check (r1493424, r1495597)
    * ra_serf: fix 'Accept-Encoding' header for IIS interoperability (r1497551)
    * svn status: improve documentation for lock columns (r1497318, r1497319)
    * ra_serf: fix support for 'get-file-revs-reversed' capability (r1498456)
    * log: reduce network usage on repository roots (r1496957)
    * diff: avoid temporary files when calling external diff (issue #4382)
    * upgrade: fix notification of 1.7.x working copies (r1493703, r1494171)
    * fix crash during tree conflict resolution (issue #4388)
    * interactive file merge: add two additional choices (r1491816, r1494089)
    * diff: use local style paths in error messages (r1500680)
    * resolve: improve the interactive conflict resolution menu (r1491739 et al)
    * switch: use local style path in error message (r1500074)
    * ra_serf: improve error output when receiving invalid XML (r1498851)
    * svn cleanup: explain what the command does in help output (r1497310)
    * blame: error on -r M:N where M>N unless server supports (r1498449 et al)
    * gpg-agent auth: don't try to use agent when unavailable (r1500762 et al)
    * gpg-agent auth: don't require GPG_TTY or TERM env vars (r1500801)
    * update: fix some tree conflicts not triggering resolver (r1491868 et al)
    * commit: remove stale entries from wc lock table when deleting (r1491756)
    * merge: fix --record-only erroring out on renamed path (issue #4387)
    * svnmucc: fix 'make install' symlink to work when DESTDIR is set (r1501072)
    * wc: fix crash when target is symlink to a working copy root (issue #4383)
    * ra_serf: change "internal malfunction" errors to normal errors \ 
(r1502577)
    * ra_serf: handle proxies not supporting chunked requests (r1502401 et al)

  - Server-side bugfixes:
    * fsfs: resolve endless loop problem when repos/db/uuid has \r\n (r1492145)
    * fsfs: remove revision property buffer limit (r1491770)
    * mod_dav_svn: better status codes for anonymous user errors (r1495918)
    * mod_dav_svn: better status codes for commit failures (r1490684)
    * fix performance regression in 'svn log' against root (r1494913)
    * allow deleting non-user-visible 'svn:' properties (r1495432)
    * fsfs: fix crash on strict-alignment architectures (r1495806, r1495985)
    * svnadmin upgrade: fix error of non-sharded fsfs repositories (r1494287)
    * svnadmin create: deny '--fs-type=fsfs --compatible-version=1.0' (r1494223)
    * svnadmin upgrade: fix data loss when cancelling in last stage (r1494298)
    * mod_dav_svn: fix incorrect path canonicalization (r1503528)

  - Other tool improvements and bugfixes:
    * fsfs-stats (tool): resolve segfault when passing invalid path (r1492164)
    * svn-bench: fix help output (r1493951)
    * svnpubsub: add version header to server (r1491707)

 Developer-visible changes
  - General:
    * ra_serf: fix some test runner issues on Windows (r1490679)
    * fix two issues in reverse svn_ra_get_file_revs() (r1492148, et al)
    * handle --compatible-version=1.8 in the C tests (r1494342)
    * improve clang compatibility (r1480080 et al)
    * use proper cancel baton when handling conflicts (r1495850)
    * fs: BDB: provide proper error value from BDB (r1495428)
    * ra_serf: tweak connection failed error value (r1496132, et al)
    * svn_client_log5: resolve possible segfault (r1496110)
    * fix metadata_only move to work when target is unversioned node (r1498564)
    * ra_svn: fix segfault with a NULL commit message (r1498550, r1499727)
    * Ev2: correctly initialize node kind in shims' change table (r1501058)
    * Ev2: fix copyfrom URL construction in shims (r1500226)
    * fs: improve test against newlines in filenames (r1498483 et al)
    * make building with BDB 6 an opt-in feature (r1499438)
    * sqlite: allow placing amalgamation in build dir (r1499034, r1500175)
    * ra_svn: make sessions usable after log callback early out (r1503554)

  - Bindings:
    * swig-rb: fix tests with out-of-tree-builds (r1492295)
    * javahl: fix encoding of error messages produced by javahl (r1492264)
    * swig-pl: silence compiler warnings (r1487094)
    * swig-pl: improve documentation (r1488693, r1490721, r1500904)