Checkpoint, need to have ISR at top and not Reset_Handler after all.
Pull bootloader entry pin config out to constants.
Remove errornous makefile line.
Merge branch 'master' into 2-address-not-actual
Change to Blueboard entry button by default.
Revert "Change to Blueboard entry button by default."

This reverts commit 51c7ee2f1f63a178e6c76f1b2a23dfee6999f758.
Add a script to assist flashing user code to the bootloader from Linux.
Load correct address of user code, not stack pointer. Back to stock!

Fixed #2.