[db] adds some snap view_attributes
[db] snap view_attributes
[db] prevents snaps from being draged to "same position"
increase size of blocks
[db] added block border width to view_attributes
updates the visual characteristics of the blocks
[db] made snap dragover less dense color
updates the base_adapter and ros_adapter to work with the update
view_attributes
[db] updates topology Band's rank to be unique
adds adapter interface for reordering band ranking - no implementation
yet