New firmware for the Swissmicros DM15L

[Helix]

Now the firmware appears almost complete to me.
Matrix calculations are interesting on a graphical calculator like the Hp 50g, but not on a Voyager format in my opinion.
The only thing I would like to see fixed is the case of entire powers of negative numbers. The workaround is easy, but if this special case could be trapped by the firmware, that would be fine. Hopefully, this won’t require too much memory space.
I can live without an improved algorithm for integration.
I think now that this firmware deserves a more suitable hardware than my small DM15, and I will purchase a DM15L next year just for it.