Version Control With Subversion Source

* en/book/ch04-branching-and-merging.xml
* en/book/ch09-reference.xml
</screen> tags should be fully left-aligned.

* en/book/ch04-branching-and-merging.xml
(svn.branchmerge.advanced.blockchanges): Discuss and demonstrate
the transitive nature of --record-only merges new in 1.7.

* en/book/ch04-branching-and-merging.xml
Remove two FIXMEs that were fixed in r4126.

* en/book/ch04-branching-and-merging.xml
Remove some more undesired whitespace before closing </para>
tags.

* en/book/appb-svn-for-cvs-users.xml,
* en/book/ch03-advanced-topics.xml,
* en/book/ch04-branching-and-merging.xml,
* en/book/ch06-server-configuration.xml,
* en/book/ch07-customizing-svn.xml,
* en/book/ch09-reference.xml,
Remove undesired whitespace before closing </para> tags.

Remove whitespace between the opening <para> tag and the
content of the paragraph.

* en/book/ch04-branching-and-merging.xml
* en/book/ch06-server-configuration.xml

Update some text which implies 1.6 is the most recent version.

* en/book/ch04-branching-and-merging.xml
(svn.branchmerge.cherrypicking,
(svn.branchmerge.advanced.blockchanges):
* en/book/ch05-repository-admin.xml
(svn.reposadmin.basics.backends.fsfs.revfiles,
svn.reposadmin.maint.diskspace.fsfspacking):
Like it says at the top.

* en/book/ch04-branching-and-merging.xml
(svn.branchmerge.basicmerging.mergeinfo.inheritance): Add an index
entry for 'subtree mergeinfo' referencing the sidebar on that very
topic.

Without going too crazy, try to explain subtree merges
and subtree mergeinfo.

* en/book/ch04-branching-and-merging.xml
(svn.branchemerge.basicmerging.stayinsync.subtree): New sidebar
covering the basics of subtree merges and subtree mergeinfo.

(svn.branchmerge.basicmerging.mergeinfo.inheritance): Add an id
attribute to the sidebar on mergeinfo inheritance, so we can
reference it from the new sidebar above.

Grammar tweak

"developers that edit" -> "developers who edit"