This is necessary to use some C++ APIs, and ugly if not impossible
to work around using cname specifiers and external files.

looks like the declaration analysis phase is too early for building type conversion utility code - do it during type analysis

fix cpp_vector_in_generator test by calling create_from_py_utility_code() early enough to let it inject Cython utility code

use completely separate workspaces for tests to fix cleanup on failures (and to make sharding/parallel test runs straight forward)

fix name setup for package __init__ modules, make sure package is registered when importing its __init__ module; fixes initial_file_path test in Py3.3