[Cuis] Predicates for dialects

[Casey Ransberger]

Here's some predicates from Squeak. I should get #isCuis into Squeak soon
if it isn't there in the trunk (I've been using the stable version lately.)

Example:

SystemVersion current isPharo        --> false

This way we might be able to push some of the changes we need in external
packages upstream. I like the convention.

-- 
Casey Ransberger
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