issue2636-20090810#3.zip adds more Unicode character properties such as
"\p{Lowercase_Letter}", and also Unicode script ranges.

In addition, the 'findall' method now accepts an 'overlapped' argument
for finding overlapped matches. For example:

>>> regex.findall(r"(..)", "abc")
['ab']
>>> regex.findall(r"(..)", "abc", overlapped=True)
['ab', 'bc']