Isense Configuration for Suggestions

[rosenbrockc]

Include a new <isense> tag in the config.xml file that allows the completion suggestions to be customized. Allow the developers to choose the tags and attributes that get used when compiling the tooltips. This should be really quick to implement because of the XML structure and because we already have the machinery in place for finding the docstring elements based on the code context. It is just a matter of choosing new attributes/tags to include.

Probably will only take half and hour.