This keymap attempts to match the Kinesis Contoured (aka Advantage) default
layout as closely as possible. See
http://www.kinesis-ergo.com/wp-content/uploads/2013/06/advantage_layout_win.pdf
Apart from the obvious mappings, this keymap also:
* removes the dual-purpose momentary layer/normal keys: Z, /, and Grv;
because the author--coming from a Kinesis keyboard--finds the delays and
accidental modifiers to be more disconcerting than helpful.
* puts Esc in the bottom left since there's no place for it in the top
left to match the Kinesis.
* changes the bottom-right key into an L2 toggle since there's otherwise no
way to get to L2.
* adds PrScr, ScrLk and Pause to the L1 keymap, down the left side, since
they're present on the Kinesis but not available in the default
ergodox_ez keymap.
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