start rcloud.dcplot
start to configure rcloud.dcplot for require
working rcloud.dcplot package

works but it 'requires' wdcplot.js still be in htdocs/lib/js
clarify -enter key combos; punct
add RCS doc link
rcloud.dcplot zzz initializer
double-set readonly to compensate for incomplete MVC

some UI components read the readonly bit when they are starting up, while
others only adjust when the even percolates through.  so do both.  :-(

fixes #738
remove dc, crossfilter being loaded from CDN now
use protocol-agnostic url for dc and remove suffix requirejs didn't like
add incantation to generated javascript to make it debuggable
update array generation for placeholder expressions

it was broken

also generalize comma-separated expressions in general (for functions)
and make it more functional (use array.join)

also put parens around function expressions so they can be eval'd alone
remove obsolete dc reference

add tree.jquery reference (we'll get all of them eventually)
Merge branch 'feature/rcloud.dcplot' into develop
remove obsolete dependencies from obsolete makefile