directly call into CPython's Unicode writers to format float/int values, rather than going all the way through PyObject_Format() and its method lookups

fix docs example: getArea instead of undefined getLength

Replace "int(val) == 0" by "not val" for gdb.Value instances

completed some signatures in Includes - libc.math and numpy.math

Initial Cython patch for Pyston.

rely on code generation phase to include required utility code instead of always including all of it in a separate pipeline phase