Version Control With Subversion Source

Apparently it's 2016 now. Sheesh.

Add more years to the <copyright> block.

Finish issue #235 ("1.8 change: In-memory password caching via GnuPG
Agent (Unix client)").

* en/book/ch03-advanced-topics.xml
(svn.serverconfig.netmodel.credcache): Note the support of the GPG
Agent as an auth store, too.

* en/book/ch07-customizing-svn.xml
(svn.advanced.confarea.opts.config): Include "gpg-agent" in the list
of default auth stores.

Merge from ^/trunk/en r5094.

Finish issue #190 ("Incorrect statement in svnsync command-line
reference (?)").

* en/book/ref-svn.xml,
* en/book/ref-svnmucc.xml,
* en/book/ref-svnrdump.xml,
* en/book/ref-svnsync.xml
Universally tweak the example usage of the --config-option option in
the Reference matter to show how to disable HTTP compression,
something that applies to all of the relevant binaries (unlike the
use of autoprops or the use of the Serf HTTP library).

Finish #194 ("Fix about the use of external diff tools: 'svn diff
--force' allows it!").

* en/book/ch07-customizing-svn.xml
(svn.advanced.externaldifftools): Note that 'svn diff --force' will
perform a real diff even if MIME types indicate that it shouldn't.

Fix issue #233 ("Inconsistent example code for treeconflict").

* en/book/ch02-basic-usage.xml
(svn.tour.treeconflicts.example): Fix the "left side" label of a
couple of 'svn diff' output examples to read "revision 14" instead
of "working copy".

Merge from ^/trunk/en r5089.

Merge from ^/trunk/en r5089.

Finish issue #232 ("SSL is not only encryption").

* en/book/ch01-fundamental-concepts.xml
(svn.basic.in-action.wc.tbl-1): Claim that https provides "SSL
encapsulation (encryption and authentication)".