New firmware for the Swissmicros DM15L

[jebedeo]

John,

Thanks for the encouragement, I'm glad you like it!

I fixed the bug of ->H not using the buffer and requiring data on the stack, and I also fixed the bug you found in ->H.MS, thanks for finding those

Also, the arctan(1) bug is now fixed!

I added an annunciator for the polar mode, P, thanks for the suggestion.

As far as the rectangular/angular conversion for real number, I'm not sure what's the best way to handle it. Since the calculator is always in complex mode (the display doesn't show the imaginary part if it's 0, but the stack is always complex) I made the P and R button just a way to select the display mode, akin to FIX or SCI.
The idea is that the user can do that conversion if they need to, by using the complex number. I could implement some sort of R/P conversion for real numbers which checks that X and Y on the stack are real before converting, but as I am already at 97% of flash memory usage I gotta save every byte I can. I am of course open to suggestions!

Thanks again,
-jebe

PS. I am from now on going to upload the latest firmware to the top of the thread only, so it doesn't get too confusing.