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Refactoring: Use RUNLOGOPROGRAM instead of duplicating its logic.

Add tests for ZCOR.

Add tests for YCOR to the full test pass.

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.