this commit:

this commit:
    - adds range support to character classes
    - fixes out-of-bounds references to the case-folding array
        when doing case comparisons for 8-bit message text
    - makes character classes as case tolerant as the rest
        of the pick regexp machine.  (where lowercase chars in
        patterns should match uppercase in the text.)
    - fixes an uninitialized pointer warning, which might actually have
        been a real bug