FMSLogo Code

Add more regression tests for DEFINE.
This was done to prepare for some refactoring in define_helper().

Replace TRUE with 1 and FALSE with 0.
In this case, the value isn't treated as a boolean, so it's not correct to use TRUE and FALSE.

Refactoring: Use true intead of TRUE when calling compare_node().
It accepts a bool, not a BOOLEAN.

Update a bug number in a comment to match the bug's current number.
When FMSLogo started, all tickets from all projects shared the number space.
Later, each project was given its own bug numbers and all existing bugs were renumbered to be much smaller.
External references to the larger bug numbers were not updated.

Rework proc_name_arg:
- Remove the side effect of modifying the argument list.
- Change it to accept the argument, not the argument list.
- Make it intern the argument name, since all callers did that.
- Rename to intern_proc_name_arg to reflect the new behavior.

Add more bad input tests for ARITY to prepare for some refactoring of proc_name_arg().

Rewrite proc_name_arg() in terms of validate_argument().
This is a step toward removing the side effect of modifying the arguments list.
Unfortunately, this required making IS_VALID_ARGUMENT accept a non-const NODE* because numberp() modifies its input.

Fix Bug #612; COPYDEF of procedure defined with DEFINE now has the correct title line.

Change mustDerefStringnode to mustGcrefStringnode in numberp().
A ref and a deref are not necessary. A simple gcref suffices.
Unfortunately, the flag is still needed because numberp's argument may not have any references.

Add a missing line break