BricsCAD-specific Lisp Error Control Functions and Variables

There are a number of specific Lisp functions provided by BricsCAD Lisp engine, which are likely not present in other AutoLISP compatible CAD systems' Lisp engines.

Therefore, using these BricscCAD-specific Lisp functions will cause your Lisp code to fail when running on other CAD systems - so it is in developers responsibility to carefully use them.

We plan to duplicate (most of) these functions to the VLE Function Library, as this allows to make them available on other CAD platforms as well (wherever possible), providing better compatibility for developers' Lisp applications; this means, these functions documented here will always remain implemented, but VLE functions should be preferred.