Add todo/multiple setup option on command line

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+While playing with Perl setup I by accident found multiple setups can be specified on command line like:
+
+    ikiwiki --setup COMMON.setup --setup MY.setup
+
+Could this be an official feature, in which case it would be nice documented or an "undocumented one" to avoid?
+
+What about Perl setup files which are undocumented but in the source code.
+I have found out after all...
+
+See also:
+
+* [[/forum/Best_way_to_share_settings_between_repositories]]
+* [[/todo/support_includes_in_setup_files]]