* Add carvac_dv keymap for mitosis
* Add mouse keys
* move backspace, etc, and fix tab
* remove commented-out functions in keymap
* Fix scroll buttons and add left/right scrolling
* Make num momentary, add comments, and clean up
* fix mouse scroll acceleration
* Add tab, remove bksp, move print screen
Having tab next to control and alt makes for much easier
alt-tabbing and ctrl-tabbing.
That displaced print screen, but I had never used the non-layer
backspace on the right hand, so I moved printscreen over there.
