Epsilon: percentage placement on N0110

[AlexPMLikesNumWorks]

Problem:
The N0110 has now a percentage sign in alpha mode. instead of the backspace character. This makes editing very awkward and counterintuitive.

Suggestion:
Why not place the % on top of the .10^x key, still unused in alpha mode and much much less useful than the backspace in alpha mode?
At least make it configurable, so as to allow conservation of backspace capability while typing in alpha mode if the user prefers. This is much more important than the accessibility of the % symbol.

[parisseb]

I have moved it to shift-division key in the Delta firmware and restored backspace as backspace in alpha mode too. The position is easy to remind because % is integer division remainder in Python.

[artaxxx]

It is convenient to keep the % sign on the keyboard. So we finally decided to disable it only in "alpha lock" mode to avoid this editing problem.

[RedGl0w]

It is convenient to keep the % sign on the keyboard. So we finally decided to disable it only in "alpha lock" mode to avoid this editing problem.

At least, the epsilon users will be used to omega :trollface:
https://github.com/Omega-Numworks/Omega/pull/101/files

[RedGl0w]

It is convenient to keep the % sign on the keyboard. So we finally decided to disable it only in "alpha lock" mode to avoid this editing problem.

Is it already done ? or should I PR epsilon too ?

[RedGl0w]

This issue can now be closed with #1479 merged