wiki_file_regexp vs CGI bug

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+I've set `wiki_file_chars` to a non-standard value in the setup file:
+
+    wiki_file_chars => "-[:alnum:]+/.:_\x{1f310}\x{1f430}",
+
+(In case you're wondering, [this is the page](http://xn--9dbdkw.se/🌐/).)
+
+ikiwiki recognises my pages when I run it from the command line, but
+when I edit something through the CGI "script", ikiwiki would suddenly
+not recognise them.
+
+By running `strings` on the CGI wrapper I found that the option
+`wiki_file_regexp` was still at its original setting.  So as a workaround,
+I added this to the setup file and everything worked:
+
+    wiki_file_regexp => qr/(^[-[:alnum:]+\/.:_\x{1f310}\x{1f430}]+$)/,
+
+Maybe the CGI wrapper should specially call `checkconfig`, which is
+the function responsible for updating `wiki_file_regexp`?