[FIX][BUG] FileContentsBrowser/PseudoClass bug pretty printing ( a fix )

[ned at squeakland.org]

As reported by David Shaffer, 

If color pretty printing are enabled, if a method being viewed in the 
FileContentsBrowser includes an i-var reference which the PseudoClass 
can't find in it's scope table, you get the attached stack trace.  I'm 
not exactly sure how PseudoClass is supposed to work so I don't know if 
this is considered a bug (*) in that class but I think that the browser 
should non-pretty print the text if parsing fails.

This CS adds instVarNames to PseudoClass to avoid this bug.
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