Also <jhindexer> and other useful things. Only the
parts of nbantext.jar which would be useful to
module authors (not necessarily doing work on
netbeans.org). Also include Javadoc for these
tasks, and some information in help on how to use
them, example usage in the sample build script, etc.

Including built-in task bindings is not really
necessary; for the build scripts to be useful,
they should use <taskdef> explicitly anyway, in
which case after being run once as custom tasks
the introspected info will appear automatically
(permitting code completion etc. on the tasks).