Better map features

[graft]

The 'map' page, while a useful initial effort, needs some improvement. Here are a list of suggested improvements:

• Map improvements
  • [x] Edges should indicate directionality for parent -> child relationships
  • [ ] non-parent->child links should be drawn as curves.
  • [ ] Edges should indicate one-to-many and many-to-many relationships.
  • [x] Text should be legible for all nodes without overlapping.
• Model view improvements
  • [x] Style changes to deal with sizing, wrapping and overflow problems
  • [x] Style improvements to normalize font usage and color
  • [x] Attributes should be labeled as such
  • [ ] Link attributes should be indicated as such, with the linked_model's map node available as a clickable link.
  • [x] Parent and identifier attributes should be indicated separately.
• An attribute view should be added to show details of an attribute
  • [x] Attribute class, description, type, match, and link_model at least should be indicated.
  • [ ] The user may run a search within this view to retrieve and display example values of this attribute in the existing dataset.
• Map search
  • [ ] The user may do text search across the map to find matching models/attributes by model_name, attribute_name or attribute description.
  • [ ] The results list links back to the model/attribute view for each entry.