remove displayer.css and unify w site mostly

- Use the reify decorator to cache results of expensive Store calls
  made during displayer rendering.
- Re-work the displayer to have annotations more like the threading
  on the client. In other words, pass the whole annotation, not just
  the fields in the the displayer.
unused variables and white space
more unused variables
need literal text for the commands or else they get all run otgether
use double colon at end of paragraph instead
Merge pull request #402 from edsu/reformat-ubuntu-install

Reformat ubuntu install
Fixes #405
Fix overflow problem introduced in the #406 bugfix (scrolling is missing)
add migration script for thread->references
Merge branch 'displayer-unification' into develop
shadow sheet, don't shadow paper
restore full white background