make sure the optimised try-finally always generates code for the original finally block subtree (just in case it references something external)

--HG--
extra : amend_source : c948151354a77be026c92d57abc151e51fb271c6

mark node position in C file when starting to generate the node's code, not that of the subexpressions

--HG--
extra : amend_source : 566ce3ed6bd0efbb075126a6c5823b773c72d2ea

undo the Python-optimisationism of assigning bound/unbound methods to local variables when Cython can call a builtin C function instead

--HG--
extra : amend_source : 121eadd540f25f9e43f6e6b60853eeab18d11620

let RemoveUnreachableCode discard any PassStatNodes (e.g. added by analysing declaration-only ExprStatNode)

--HG--
extra : rebase_source : 2e86ee2423754e0cfa6e79b33b9570a25a019c01

minor portability tweak: mark non-tiny integer literals as C longs with "L" suffix when passing them into PyInt_FromLong()

avoid accidental duplication of cached Python integer constants when using numbers in different notations

try fixing test failures in int_literals.pyx by removing dependency on Py2/3 specific 'L' postfix of long objects

discard lots of useless code and overhead from try-finally statements that don't need to handle Python exceptions (including C-only with-blocks)