of ParserCreate().

Added assignment tests for the ordered_attributes and specified_attributes
values, similar to the checks for the returns_unicode attribute.

are different (Ping couldn't test this).

message, and tries to make the messages more consistent and helpful when
the wrong number of arguments or duplicate keyword arguments are supplied.
Comes with more tests for test_extcall.py and and an update to an error
message in test/output/test_pyexpat.

information from the Expat library that is not part of its public API.
Do not print this information as the format of the string may (and will)
change as Expat evolves.

Add additional tests to make sure the ParserCreate() function raises the
right exceptions on illegal parameters.

to the Python style guide, and remove unneeded imports.

parsing the sample data once with 8-bit strings and once with Unicode.