Move hub link direct to proposals

This version has many changed code references to accomodate the new schema and seems to completely work, except for searching by Hub.

Also, I was a bit foggy on exactly how to relate Votes and Hubs.  I ended up with:

Votes:   (the last two being commented out)
 ````
  belongs_to :hub, inverse_of: :votes      # Replaces # belongs_to :hu
  # belongs_to :hub, through: :proposal    # Kim's experiments creating an  association to hubs
  # has_one :hub through: :proposal        # Kim's experiments creating an  association to hubs
````
and Hubs:
````
  has_many :votes, through: :proposals
````