Patch by Michele Orrù.

Patch by Rodolpho Eckhardt.

Schemenauer.

Patch and tests by Brian Harring, with improvements by Ralf Schmitt.

Issue 9732: remove use of __class__ in inspect.getattr_static and note the mro exception to code execution

Issue 10326: further extend test for unpickling to ensure type lookup mechanism works after unpickling

Issue 10326: TestCase instances can now be pickled (they store names of instance methods instead of references to the instance methods themselves).

Also corrects a typo from a previous commit.  Unfortunately
this does *not* fix issue #10134.

socket.gethostbyname(socket.gethostname()) can fail when host name resolution is not set up correctly; do not fail test_socket if this is the case.

complex zeros on systems where the log1p function fails to respect
the sign of zero.  This fixes a test failure on AIX.