Supported interwiki mapping details in the make_linker convenience function.
Supported mapping arguments in the conversion script.
Added an interwiki link to the relevant test.
1 = Level 1 =
2 Text
3 == Level 2 Heading ==
4 Text
5 Not == a heading ==
6 == Not a heading == either
7 = Mismatched heading ==
8 == Another mismatched heading =
9 === Heading __Underlined__ ===