#1 Variable recursion detection

[Kyle Wheeler]

Wcalc should detect and disallow/complain when active
variables recurse.

[Kyle Wheeler]

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A fix is in the CVS and will be in the next version. It detects and complains when expressions have variable recursion. It doesn't yet disallow it (i.e. prevent you from setting up recursive active variables), but this was the critical part (avoiding crashing!).