FMSLogo Code

Add some more test coverage for SETITEM

Add missing curly braces

Fix Bug #513; PORTWRITEARRAY no longer leaks memory.
This adds a missing gcref() to free non-INTEGER NODE which cnv_node_to_intnode may allocate.

Remove some redundant code in lportreadarray()
This was done to make the code more readable.

Replace "char rxchar[64]" with "char rxchar", since only one byte was used.
This was done to make the code more readable.

Reduce the scope of the "#ifndef WX_PURE" blocks so that more of FMSLogo is compiled for GNU/Linux
This doesn't add any useful functionality on GNU/Linux. It's mostly for testing.

Change PORTWRITEARRAYTEST.BADINPUT to not expect an error when given array of bad input.
This matches the resolution of Bug #515, which is that PORTWRITEARRAY should silently replace bad input with an ASCII space character.

Fix Bug #514; PORTWRITEARRAY now writes ' ' instead of random memory for non-int items in its array input

Throwing a bad input error risked compatibility problems. Writing NUL would break old text-based protocols that use COM communication. Writing an ASCII space seemed to be the safest way to ignore garbage input.

Fix bug #515; PORTWRITEARRAY now throws a "doesn't like input" error for its second input.

The motivation for this change is that PORTWRITEARRAY used to show a message which incorrectly referred to the first input when given a non-array second input. I could have instead corrected the text, but that would have left the non-English translations incorrect. This fix makes PORTWRITEARRAY act more like a typical FMSLogo procedure, throwing an error instead of displaying a dialog box that cannot be interacted with programmatically.

Since, after showing the dialog box with the incorrect message, PORTWRITEARRAY used to throw a "Stopping..." error, changing this to throwing a "Doesn't like input" error has negligable risk to backward compatibility.

Update the documentation for PORTWRITECHAR to match the implementation.
Specifically, PORTWRITECHAR ouptuts -1 on error, not 0.