FMSLogo Code

Update the version to 6.10.1+

Add regression tests for RUNRESUT, including one for bug #1547408; 'RUNRESULT {1}' crashes FMSLogo.

Minor changes to make the code a little clearer. This is mostly restructuring code into an equivalent (but clearer) form.

Add regression tests for RUNRESUT, including one for bug #1547408; 'RUNRESULT {1}' crashes FMSLogo.

Correction: I did not fix bug #1458661.
I fixed bug #1547408; 'RUNRESULT {1}' no longer crashes FMSLogo.

Fix bug #1458661; Macros that output nothing no longer crash FMSLogo.

Here is a description of the bug:
RUNRESULTcreate a continuation node. Continuation nodes store a
number, not a NODE* in their "CAR" field (the ID of where
they should continue evaluating from). Normally, this is
overwritten with NIL when the continuation is used.
However, if there's an error, the continuation is cleaned up
before the CAR field is cleared to NIL. And there was a bug
in gc(), which is where all NODE* are cleaned up, that tried
to free the CAR of continuation nodes. This resulted in an
access violation, as you obviously can't free() the number 11.

The fix is to only free the CDR of a continuation NODE* in gc().

This fix will be released in FMSLogo 6.11.0.

Add a REVISIT comment to add tracing logic where UCBLogo has it.

Add a link back to the project portal on SoureForge, since that is the #1 link that I want people to visit.

Also move "The Logo Workshop" to be the second link, since that is the #2 link that I want people to visit.

Add a list of supported features, mostly to fill in some space (the content that was there did not feel substancial enough).

Fix a typo.