Plus42 Equations, Preview Release

[Thomas Okken]

New update:

1. When the function called by the solver had an error, the immediate return to the solver did not take care of restoring the previous stack mode, so if this happened while executing generated code, you would end up in NSTK mode. (This affects Free42 as well and will be fixed in the next release.)
2. When a run-time error occurred while executing the code generated by the direct solver, the numerical solver invocation that would run next would not terminate properly, failing to display the appropriate final message.
3. Added MATRIX, BASE, CONVERT, and PGM.FCN menus.