FMSLogo Code

Update the version to 6.16.0 for the next formal release.

Fix a typo.

Add the changes for 6.16.0.

Add some new tests, including tests for CASCADE. Also update to changes in Logolib (now they throw properly localized bad input errors).

Add a test for SETPENCOLOUR, SETSCREENCOLOUR, SETFLOODCOLOUR, PENCOLOUR, SCREENCOLOUR, and FLOODCOLOUR. These are only supported in the English version of FMSLogo.

Fix the "too many inputs" test, now that THROW has a form that takes more than three inputs.

Reformat the code to make it a little easier for me to read.

Replace "pu" with "penup" and "pd" with "pendown" because "pu" means something else on the Portuguese translation of FMSLogo.

Replace "se" with "sentence" because "se" means something else on the Portuguese translation of FMSLogo.

Also make some of the variables local to remove some of the clutter at the bottom of the file.

Replace "pu" with "penup" and "pd" with "pendown" because "pu" means something else on the Portuguese translation of FMSLogo.