…umber answers regardless of the answer evaluator setting. Also remove PGcomplexmacros2Exp.pl, an unused file that duplicates PGcomplexmacros2.pl
… if they had applet hints.
…aren't too many of them and if they aren't too long.
…ntered, and add the InequalitySetBuilder classes, since they aren't part of the default Interval context.
…ialization to a separate Init function for AlternateDecimals.
…e don't know if the result is actually negative or not when it is a formula).
Also, disallow unary plus for numbers, and prevent (2-3) from being interpreted as (2 -3). (It now produces an error message.)