Merge r1513874 from trunk:

 * r1513874
   Fix packed revprop manifest growth in FSFS
   Justification:
     Users that frequently change existing revprops may, over time,
     experience a performance degradation.
   Votes:
     +1: stefan2, danielsh, breser


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/1.8.x@1516007 13f79535-47bb-0310-9956-ffa450edef68
Merge the r1514295 group from trunk:

 * r1514295, r1514318, r1514356
   Add serf library version information to svn --version.
   Justification:
     Makes ra_serf issues diagnostic a little bit easier.
   Votes:
     +1: ivan, danielsh, breser


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/1.8.x@1516010 13f79535-47bb-0310-9956-ffa450edef68
Merge r1515119 from trunk:

 * r1515119
   swig-py: prevent a segfaulting function from being called.  Also hide it
   from swig-pl where it is unusable (raises a TypeError(!?) if called).
   Justification:
     It's a segfault.
   Votes:
     +1: danielsh, breser


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/1.8.x@1516014 13f79535-47bb-0310-9956-ffa450edef68