new autotestdict.{cdef,all} directives that put cdef and non-doctest docstrings into __test__, skip non-doctest docstrings by default

--HG--
rename : tests/run/autotestdict.pyx => tests/run/autotestdict_all.pyx
rename : tests/run/autotestdict.pyx => tests/run/autotestdict_cdef.pyx