update Finer Points section of docs to cover boolean evaluation;
add more tests for pure and mixed boolean evaluation

Previously zipimport mistakenly limited namespace support to only the
top-level of the zipfile when it should have supported an arbitrary
depth.

Thanks to Phil Connel for the bug report and initial patch and Mike
Romberg for the final patch.

Permission was validated prior to adding these markings.

While no copyright violation occurred, the license which
'Numerical Recipes' operates under is not amenable to Python,
so to prevent confusion it's easier to simply remove its mention.

Removed SSL_ERROR_SYSCALL checking from ssl_io_loop() so that the loop can
terminate when unwrap() raises that error.

This is instead of svn.python.org, whose certificate recently expired, and
whose new certificate uses a different root certificate.

The certificate used at the pythontest server was modifed to set the "basic
constraints" CA flag. This flag seems to be required for test_get_ca_certs_
capath() to work (in Python 3.4+).

Added the new self-signed certificate to capath with the following commands:

cp Lib/test/{selfsigned_pythontestdotnet.pem,capath/}
c_rehash -v Lib/test/capath/
c_rehash -v -old Lib/test/capath/
# Note the generated file names
cp Lib/test/capath/{selfsigned_pythontestdotnet.pem,0e4015b9.0}
mv Lib/test/capath/{selfsigned_pythontestdotnet.pem,ce7b8643.0}

The new server responds with "No route to host" when connecting to port 444.

Patch contributed by Swati Jaiswal.

Patch contributed by SilentGhost.

Patch contributed by Robert Zimmerman.