#6810: add a link to the section about frame objects instead of just a description where to find it.

this affect text files opened with io.open(), and the print() function of py3k

No longer use tarfile.normpath() on pathnames. Store pathnames
unchanged, i.e. do not remove "./", "../" and "//" occurrences.
However, still convert absolute to relative paths.

Decimal.compare_total_mag.

Allow the XML-RPC server to use the HTTP request path when dispatching.  Added a MultiPathXMLRPCServer class that uses the feature, plus unit tests.

Add an "exc_value" attribute to the _AssertRaisesContext context manager in the unittest package.  This allows further tests on the exception that was raised after the context manager exits.

fix a mistake in instantiatiating the HTTPSConnection class.