newRPL - build 1255 released! [updated to 1299]

[_nmr_]

   

Hello.
I did add keyhandlers and key combinations to hal_keyboard.c for russian letters alike how is it done for greek letters. But it is not many unused key combinations. May be possible another way to make keyboard layouts?
And how to make custom key definitions, that can be user-installed on the standard ROM?

Bugreport:
When calculating the roots of the polynomial with the PROOT command with the vector [1 6 15 20 15 6 1] on the stack, the 49g+ hangs with a memory reset. PC-program hangs too.