https://github.com/fgui/tmk_keyboard/blob/atreus/keyboard/atreus/keymap_qwerty_altgr.c
Main reason to be able to use Colemak with languages that require AltGr+Letter combinations.
Changes from original qwerty layout.
Tab -> AltGr (Right Alt) fn+Tab -> Tab
I wanted to be able to DEL when editing text outside emacs without moving L2 some times: fn+space -> delete
Note: When uploading the changes I got confuse reading the docs. To find out the /dev/xxxxx you must turn on and off bootloading not disconnect the keyboard.