Provide more information in dj.GeneralRelvar.display

 * Show restrictions if any applied
 * Provide hyperlinks to display the primary key and
   dependent attributes
Improve display of dj.Table

A hyperlink to the documentation for a table is provided.
Improve display of dj.Schema

List all tables with hyperlinks to their definition.
Clean up dj.Connection.packageDict

Use dictionary / map class provided by Matlab
Remove display of restriction from dj.GeneralRelvar

Showing the outermost restriction can be misleading. Providing a complete
representation of applied restrictions is unnecessarily complex.
Fix handling of auto-increment.