from bg/reconnect_evaluators
Merge pull request #963 from twosigma/ildipo/minorstuff

Ildipo/minorstuff
Whitespace
Move toggle-menu above code input

Change from previous solution for layering

Fixes #951
Make `toggleCellMenu` method more flexible
Add `.advanced-only` utility class
Add language chooser in advanced mode

Fixes #902
Turn move, delete, and toggle cell buttons back on in advanced mode
merge
Merge pull request #967 from twosigma/ildipo/minorstuff

Fixed object serialization exceptions.
Merge pull request #966 from twosigma/spot/reconnect

Spot/reconnect
Merge pull request #964 from twosigma/jb/fixes

UI Bug Fixes