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Cleanup: Remove an unnecessary special case in lcount() for NIL.
This is already handled by the is_list() case.
I suspect that, at one time, is_list didn't check for NULL before looking at the node type.

Always compile debugutils.cpp, but remove code if DEBUG isn't defined.
This saves the effort of figuring out how to include it when it's needed.

Fix "FD 100 5**6" to run FD 100 before throwing a "not enough inputs to *" error.
This is part of fixing Bug #250.

Fix "FD 100 (" so that it runs FD 100 before throwing an error.

Fix Bug #250; instructions with too many inputs no longer prevent earlier instructions from being run.
This was fixed as a generalization of g_ParseErrorNotEnoughInputs to handle other error types.

There are more parse errors not included in this fix that can prevent earlier instructions from being run.
It's not clear if they'll all be able to use the same mechanism.

Add unnecessary parentheses to stop gcc from warning about if conditions.

Add a regression test for Bug #603 (parenthesized unknown proc prevents evaluation before it)

Cleanup: Remove TRUE and FALSE #defines.
These are no longer needed. Any future need will use C++ true/false.

Update the expected test log with recent additions to the tests and bug fixes.

Simplify the memory management in err_logo from ref/vref/deref to a single gcref().