Need to check return result of PyInt_AsLong()

Will backport.

From SF patch #852334.

imports e.g. test_support must do so using an absolute package name
such as "import test.test_support" or "from test import test_support".

This also updates the README in Lib/test, and gets rid of the
duplicate data dirctory in Lib/test/data (replaced by
Lib/email/test/data).

Now Tim and Jack can have at it. :)

and replaces them with a new API verify(). As a result the regression
suite will also perform its tests in optimization mode.

Written by Marc-Andre Lemburg. Copyright assigned to Guido van Rossum.

In test_poll1(), unregister file descriptors as they're closed,
    and also close the read end of the pipe
In test_poll2(), make the code assume less about the combinations of flag
    bits that will be returned

subtle breakage on Windows (the test is skipped here, but the TestSkipped
exception wasn't recognized as such, because of duplicate copies of
test_support got loaded; so the test looks like a failure under Windows
instead of a skip).
Repaired the import, but

        THIS TEST *WILL* FAIL ON OTHER SYSTEMS NOW!

Again due to the duplicate copies of test_support, the checked-in
"expected output" file actually contains verbose-mode output.  I can't
generate the *correct* non-verbose output on my system.  So, somebody
please do that.