[Dev] keeping up with wiki changes

[Ducky Sherwood]

I have recently made two small improvements to the wiki that should make 
it slightly easier to keep track of changes.

These changes mean that in a few places, it is now a one-click operation 
to get to the "what changed recently on this page" page (aka the "diffs" 
page) instead of a two-click operation.  Instead of having to click to 
go to the full page (aka the "view" page), then click to the "diffs" 
page, you now have the option of clicking straight to the "diffs" page.

    + RSS feed: You can now subscribe to an RSS feed that gives you 
links to the "diffs" pages instead of links to the full page.  To change 
from subscribing to "views" to subscribing to "diffs", edit the "view" 
RSS URL to replace "WebRss" with "WebRssDiff".  For example, instead of
    http://wiki.osafoundation.org/bin/view/Chandler/WebRss?skin=rss
subscribe to
    http://wiki.osafoundation.org/bin/view/Chandler/WebRssDiff?skin=rss

    + Searches (including WebChanges): Search results on the wiki now 
have a link to the "diffs" page right after the topic name (which still 
links to the "view" page).

As always, you can get to the "diffs" page from the "Diffs" links in the 
bottom and next-to-top horizontal link bars on the wiki skins.