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Add tests for XCOR.

Add tests for SETY and SETZ into the full test pass.

Add tests for SETX to the full test pass.

Add tests for SETPOSXYZ into the full test pass.

Fix SETPOSTEST.BADINPUT.RECOVERABLE to check that value from :erract is honored.

Integrate SETPOSTEST.LARGENUMBERS into the overall test pass.

Refactoring: Change the remaining calls to float_arg to call flonum_arg instead.
flonum_arg is similar, except that takes the argument itself (not an argument list) and doesn't modify its parameter.

This is part of a larger effort to reduce the complexity of the code base by removing unneeded side effects.

Add FORWARDTEST.BADINPUT.RECOVERABLE

Change positive_numeric_arg to positive_flonum_arg, following nonnegative_flonum_arg().
Instead of returning a NODE*, it returns a FLONUM. This is simpler for the caller.

Instead of being parametrized by the list, it takes the argument to convert.
Therefore, it no longer has the side effect of modifying the argument list.

This is part of a larger effort to reduce the number of side effects in the code base.

Add more test coverage for when ZOOM is given bad input.