Added basic model-view classes. Added basic support for model-view in...

Added basic model-view classes. Added basic support for model-view in Directory and cnetsuite. Added new supported types to WorkOrder and marked old types as deprecated. Registered some classes with Qt's metatype system for use in the model-view framework.

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/branches/ipce@6402 41f8697f-d340-4b68-9986-7bafba869bb8