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Fix Bug #215; TONE/SOUND now play frequencies <37.
This required making SOUND throws an error when given a negative frequency/duration.

Add a special case to disable treating a leading "-" as negation when it follows a ?.
This fixes a regression (Bug #594) that was introduced when fixing Bug #589.
This restores the previous behavior applying the template "[2 * (? - 1)]".

Fix Bug #244; Halting WAIT now immediately throws a stopping error.

Add a test to ensure that WAIT is haltable.

Inline :d.ang in POLYGONTEST.COMPLEX.
This makes the code simpler, which is good for a regression test.

Inline xexpr.l, yexpr.l, and zexpr.l in POLYGONTEST.COMPLEX.
This makes the code simpler, which is good for a regression test.

Remove "IFELSE :bradius=0" from POLYGONTEST.COMPLEX.
:bradius is never 0, so this was unneeded logic that complicated understanding of the test.

Inline bradius.l in POLYGONTEST.COMPLEX.
This makes the code less general but simpler, which is good for a regression test.

Inline urange.l in POLYGONTEST.COMPLEX.
This makes the code less general but simpler, which is good for a regression test.

Rename rectpoint to POLYGONTEST.COMPLEX.RECTPOINT.
This emphasizes that it's only used by the POLYGONTEST.COMPLEX test.