FMSLogo Code

Bump the version to 6.10.1 for a bugfix release.

Replace the word "constituent" with "item", in accordance with STYLEGUIDE.TXT.

Improve the formatting a little bit and fix some minor typos.

Fix bug #1545911: The questionmark inputs in template-based iteration are now correctly restored when the template goes out of scope.

This bug is a regression introduced in FMSLogo 6.10.0 that came with fixing some crashing bugs in APPLY. Because this bug causes a breaking change in the exiting Logo programs, I am going to release a bug-fix build out of the normal release cycle.

Test that the question mark list gets restored after APPLY returns.

Update expected test log. This includes:
* New tests for REDUCE, PENSIZE, SETPENSIZE.
* Some bugfixes.

Add regression tests for REDUCE.

Add a regression test for bug #1545911, which is that nested questionmark template are not restored when an inner template goes out of scope.

Simplify a condition in list_arg() by using Modus Tollens.

Fix bug #1535582: SELECTBOX now throws an error on bad choicelist input.

Also did some code cleanup on lquestionbox().