Second half of #1752175: #ifdef out references to PyImport_DynLoadFiletab if HAVE_DYNAMIC_LOADING is not defined.

print a slightly more informative message.

sandboxes when bsddb3 tests are run.

object's co_consts tuple; add a test to show that the previous behavior (where
these two constants were "collapsed" into one) causes serious malfunctioning.

and tests for NOOP, RSET, and VRFY. Corrected typo in a comment for
testNonnumericPort. Added a check for constructing SMTP objects when
non-numeric ports are included in the host name. Derived a server from
SMTPServer to test various ESMTP/SMTP capabilities. Check that a
second HELO to DebuggingServer returns an error. [GSoC - Alan McIntyre]

to enhance readability.