Apparently assigning to $wgHooks at the top of the file breaks every
other hook, somehow. So we need to set it in setUp(), but prevent the
interwiki prefix from being queried beforehand when the dataProvider is
run. Fun.
Change-Id: I8535942e3a0e47d9a5b2ea11c1b0b63c5acf2cc5
Note that fetching any title besides the one for the current page is
considered "expensive". It also records the title fetched in the
ParserOutput so it will be listed in pagelinks, just like #ifexists.
This also moves the ToString test formatter into TestFramework.lua, so
TitleLibraryTests.lua can use it too.
Change-Id: I799f3289a37fe1349b6bca5758829acf82cb718f
