Version Control With Subversion Source

* ch00-preface.xml: typo fix from Jens M. Felderhoff <j.m.f@...>.

* ch06-server-configuration.xml: fix path-authz example, explain rule-matching better.

Fix typo.

Add missing -v flag to example 'svn log' invocation.

Finish issue #116 - ch09: Document SVNAllowBulkUpdates mod_dav_svn directive.

* src/en/book/ch09-reference.xml
Document the SVNAllowBulkUpdates mod_dav_svn directory. While here,
change the headers for the other directives to more closely resemble
the way Apache documents its own built-in directives.

Document 'svn log -v', including a list of the action codes.
(Trac ticket #107.)

* src/en/book/ch05-repository-admin.xml
Add a blurb about partial mirrors. (Trac ticket #101.)

* src/en/book/ch05-repository-admin.xml
(Repository Replication): Add a sidebar about svnsync's bookkeeping
properties. (Trac ticket #101.)

Go to town on svn:externals documentation (issue #50).

Finish issue #106.

* src/en/book/ch03-advanced-topics.xml
(svn.advanced.changelists.asfilters): Add explicit dot target to
'svn changelist' example invocations that lack it (as required
by Subversion 1.5.0 ... today.