Removed sanitization in utils.merge_description that was causing the pyx file to have an incorrect __init__ sig.
Changed the lookup of a few attribute names, as well as augmenting desc in modcpppxd, to correct problems with class names getting mangled incorrectly.
Updated xdress_extra_types.pxd to reflect the namespace being set in xdress_extra_types.h
Updated the various files in the tutorial build to reflect the previous few commits.