fix for zero visible notebooks

for rcs.ff, which continues to work completely differently from rcs.redis
take simon's fix instead of mine
no, really, take Simon's fix
Merge branch 'develop' into feature/widget-sizing
first attempt at vertical layout of panels

not working yet (but not harmful yet either)
Merge branch 'develop' into feature/widget-sizing

Conflicts:
	htdocs/js/rcloud_bundle.min.js
Merge branch 'develop' into feature/widget-sizing

Conflicts:
	htdocs/js/rcloud_bundle.min.js
complete the removal of the 51s

size to a wrapper that's under the navbar
override min-height for no-padding

for some reason it's creating a 1px border at top
typos in ids/classes

this widget-vsize isn't the greatest idea but do it right
pass a promise of everything being loaded to ui load

we need to have everything there in order to do sizing
but we can load our options at the same time
the vertical sizing algo is decent...

... but the inputs and outputs are still screwy
still need to account for:
- padding
- which element to ask about size
- having a proper parent element to size
override bootstrap pre stuff to eliminate code wrapping
discount padding for vertical layout; improve session pane layout
good vertical panel layout

consider both panel and widget padding
sum actual heading heights
delete "out" headings
hilarious if(id in padding) typo
log an error if layout fails
take first greedy per column
make help greedy
Merge branch 'feature/widget-sizing' into develop

closes #381
closes #437
fixes #415