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Add some tests for the vbar behavior of WORD

Add tests to ensure that the recoverable errors of WORD are really recoverable.

Refactoring: Rework lnumberp to use numberp instead of cnv_node_to_numnode.
This is simpler and avoids the side effect of modifying args.
This is part of a larger effort to reduce the number of side effects in the code base.

Add more tests for NUMBERP to prepare for some refactoring in that procedure.

Cleanup: Remove a work-around for a bug in ARRAYTOLIST that has now been fixed.

Add an optimization to LOGGABLEWORD that returns the given word.
In the common case, the words do not need to be escaped.

Add tests for LOGGABLEWORD

Refactoring: Use FAILIFNOTFALSE instead of duplicating its logic.

Simplify the implementation of is_barred into a single boolean expression.

Refactoring: Simplify a ref() and a deref() into a gcref().