Add breadcrumb to Browse view

[graft]

Timur's Browse view suffers greatly by not having a breadcrumb to guide the user through the project's data hierarchy. Since we are determined that the project models form a tree, every record will have a chain of parents rooted in the project's root record. We can then add a breadcrumb showing this record's position in the hierarchy.

How should the breadcrumb look? There are two possibilities:

1. Use the model names. E.g.:
   Project > Labor > Monster > Victim
2. Use the record names. E.g.:
   The Twelve Labors of Hercules > The Nemean Lion > Nemean Lion > Outis Koutsounadis

Both of these are unsatisfying - the model names does not actually situate us in record space, but the record names do not clue us in to their type. This suggests:
3) The conjunction:
project: The Twelve Labors of Hercules > labor: The Nemean Lion > monster: Nemean Lion > victim: Outis Koutsounadis
might grow verbose, but is probably the most useful. We can, if we like, only show the model names on hover, etc.