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Refactoring: Change setpos_helper() to accept "const FLONUM*" instead of "NODE*".
This adds type safety because NODE* can be any type, but a FLONUM* can only be a FLONUM.
This also clarifies that setpos_helper() doesn't modify its arguments, as NODE* can be modified but "const FLONUM*" can't.

Add tests for SETXYZ to the full test pass.

Fix a copy&paste error in a comment

Add tests for SETXY

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.