Implementation of "IsPrime", "Factors", "NextPr", "PrevPr"

[jcbenoist]

Implementation of "IsPrime", "Factors", "NextPr", "PrevPr". Tested on sim. I admit the core code is mostly generated by Claude Opus 4.6. I've done the integration to db48. If this PR is accepted, I'll do a test and will update the help files. I want to know first if this code have a chance to be integrated.

Hold on.. I'll develop tests right now, I have some suspiscions. Meanwhile, you can do comments or observations.

No, all seems OK. I'll publish tests soon.

[jcbenoist]

Tests OK (thanks Claude again). Next step is to add range check in functions. M127 seems a limit for available memory. And test that remultiplying factors gives original number.

I have to know, too, how to check if this is db48x ou db50x, or to check available memory; to set different limits for each hardware?

With reflexion, instead of a range check, is there a graceful detection of stack or RAM overflow to abort a command ? Raw implementation => SEGV in SIM (stack overflow)

[jcbenoist]

I have enhanced the tests. M73 & M83 fails for unclear reasons, since manually testing them in sim is perfectly OK. Maybe for memory or CPU reasons in a test context ? I have good confidence with the algorithms now.