[Pyrex] Speeding up custom string lowercasing with Pyrex

[skip at pobox.com]

    Bob> The "to = to + c" line strikes me as not being efficient. Python
    Bob> creates a new copy of "to" every time it appends "c" to the
    Bob> end. One common, pure-python fix is:

    Bob> to = []
    Bob> for ...
    Bob>    ...
    Bob>    to.append( c )
    Bob> return "".join(to)

This common case was sped up in Python 2.5.

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