minor Py hex version fix for patch level when Py_hash_t was added (just in case someone still uses Py3.2 alpha versions)

--HG--
extra : amend_source : 6a5e7668208a89296264b05bbfe7640514318a1d

remove duplication of type analysis for base type tuple of Python classes (could crash the compiler for non-trivial base class expressions)

implement another try-finally corner case (the Py3 way only for now!): reraising a fresh exception in the finally clause

optimise string-to-something comparisons also when we know that the result is boolean (the cmp functions have a proper fallback for non-strings)