Updated lecture 19 html and org

[Kurt Schwehr]

Hi all,

The lecture 19 org and html files had some typos (yeah, COMMENT in a
top level node is trouble!). I've just re-released them files and
they include my python history.

http://vislab-ccom.unh.edu/~schwehr/Classes/2011/esci895-researchtools/19-bag-2-xml-metadata.html

and

http://vislab-ccom.unh.edu/~schwehr/Classes/2011/esci895-researchtools/src/19-bag-2-xml-metadata.org

Without proper testing, almost all code (and lectures) has bugs!

-kurt