fixed the move api in packaging.install, and closing the handle left by mkstemp() in its test module

struct guarantees the loop will always be run once to initialize code.

Avoid also zombi processes: Popen.communicate() calls its wait() method.

Fix more ResourceWarnings in test_packaging moving the join() and server_close() in the stop method.

accept and return str instead of bytes arrays. Add some more tests.

zlib.decompress() anymore to be able to unload the module.

zlib.decompress() anymore to be able to unload the module.

to be able to unload the module.

packaging.util requires the env keyword.

Don't encode the path list

 * read: use tokenize.detect_encoding()
 * write: use 'utf-8'

Skip tests that require zlib in the packaging tests.  Also add a requires_zlib decorator to test.support.