Added a new <note> object which can be used to add annotations to
the input side. Each <note> has a <contents> area which contains
a url for a web site or a file. All file urls are treated as
relative to the "docs" directory where the tool.xml is located.
Fixed the output for <number>, <integer>, <boolean>, and <choice>
so that it shows multiple values when "All" is pressed, and it
highlights the current value. Also fixed the download option for
this widget so that it works properly.
Fixed the energy level viewer so that its download option works.
