introduction of C calls profiling events.

Fix problem spotted by Coverity that occurs if tzinfo.tzname().replace()
returns a non-string when converting %Z.

Move test code out of xxmodule and into _testcapimodule.c where it belongs.

Try to be a bit more consistent on all platforms:
 python .
 python < .

both print a message, return non-zero and do not core dump.
This hopefully fixes the failure on Solaris.

Fix and test (manually w/xx module) passing NULLs to PyObject_Str() and
PyObject_Unicode().  This problem was originally reported from Coverity
and addresses mail on python-dev "checkin r43015".

This inlines the conversion of the string to unicode and cleans
up/simplifies some code at the end of the PyObject_Unicode().

We really need a complete C API test module for all public APIs
and passing good and bad parameter values.

Bug #1448490: Fixed a bug that ISO-2022 codecs could not handle
SS2 (single-shift 2) escape sequences correctly.

_hotshot hotshot_profiler():  If write_header() returned
an error code, this let `self` leak.  This is a disaster
on Windows, since `self` already points to a newly-opened
file object, and it was impossible for Python code to
close the thing since the only reference to it was in a
blob of leaked C memory.

test_hotshot test_bad_sys_path():  This new test provoked
the C bug above.  This test passed, but left an open
"@test" file behind, which caused a massive cascade of
bogus test failures in later, unrelated tests on Windows.
Changed the test code to remove the @test file it leaves
behind, which relies on the change above to close that
file first.