Minor refactoring in Scanner class>>initialize.  Replace of hardcoded
values to mark the letters in TypeTable with a loop asking each character
for #isLetter.

This allows cleaner way to expand the #isLetter to cover non-english
letters.  Before this change a duplication was needed (Character>>isLetter
and Scanner class>>initialize methods).

Needed for all the translations efforts in progress, please consider to
include in the update-stream.

Cheers,

Diego


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