reorg all the pages about rcs backends. Fix all links

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+If the user interrupts the page loading during the running of `svn commit`,
+the repository will be left in an inconsistent state. The probability of
+this happening increases with the size of the repository and the number of
+plugins installed, because these both affect how long the post-commit hook
+takes to run. (The core issue, I guess, is that we're abusing the concept
+of a "working copy" by giving everybody the same one). Here are the main
+solutions that I can see: (1) CGI queues commits so that a single process
+can act upon them sequentially, or (2) optionally divorce the `ikiwiki
+--refresh` from the `svn commit` so that commits happen faster. -- [[Ben]]
+
+I'm not aware of web servers, at least apache, killing cgi processes when
+the user stops a page load. If this is happening ikiwiki should be able to
+avoid it by blocking whatever signal is causing it to terminate. --[[Joey]]