Version Control With Subversion Source

Issue #273 - Fix mention of svnsync in svnrdump reference

* en/book/ref-svnrdump.xml
Rewrite --revision option description for relevance.

Backport from ^/trunk/en r5285.

Backport from ^/trunk/en r5285.

Issue #272 - Fix some omissions in svnlook reference

* en/book/ref-svnlook.xml
Swap the descriptions of the --properties-only and
--ignore-properties options. Add description for --xml option.
Note the REV and ID arguments to the --revision and --transaction
options, respectively.

[fr] svnadmin Reference : translation in progress.

[fr] svnrdump Reference: translation completed.

[fr] svnmucc Reference: translation completed.

[fr] svndumpfilter reference: translation completed.

[fr] svnsync reference: fixed double hyphen within comment error.

[fr] svnsync reference : translation in progress (50%).