fix local serving of the applet jars

[#63305880]
fix sensor interactive

[#63305880]
fix dual-sensor interactive

[#63305880]
don't mess with for atom events if not md2d model
Refactor, unfiy and cleanup IFramePhone and Parent Message APIs

[#63248748]
Update application.js to use new IFramePhone API

[#63248748]
Allow non-property columns in tables

[#62270260]
Standardize table rows so index starts at 0

[#62270178]
Rm page scrolling behavior.

[#62270178]
Create input element when table cell is click; save value to data

Currently this is for all cells. Next we add authoring to select
specific columns.

[#62270178]
Create column metadata; add editable property

Columns can now be defined either by string or by

{name: x, editable: t/f}

Cells no longer become editable if column is not editable.

[#62270178]
Add ability to author format for user-entered values

[#62270178]
Quick draft version of radioactivity for table demoing
Fix issues with draggable charged objects

[#63388518]
Add simple units to columns descriptions.

Currently these only affect the column title, but this should
eventually be merged into the DataSet work so that author-defined
columns can be treated as properties and consumed by graphs.

[#62270260]
Add empty model for radioactivity demo

From Will's commit in rites-project, 
https://github.com/ritesproject/lab/commit/3e78ef4
Merge pull request #59 from concord-consortium/iframe-phone-refactoring

Iframe phone refactoring
Add Chosen submodule, follow gh-pages branch

[#63561734]
Update makefile to copy Chosen assets; add them to interactives.html page

[#63561734]
Use Chosen to make drop-down searchable; fix CSS

[#63561734]