Fixed bug where slider tool wouldn't set slider position based on
session state.

Change-Id: I1dc102af34105eb5fccff630d9f070d151e24a22
Fixed display bug when dataProvider was empty.

Change-Id: If806792b3e440d351f3930388fdb3e8a2597b8dd
fixed crash bug
improved help text formatting
Removed "X Columns" as a selectable attribute (it was causing
confusion).
mouseDown on slider track now updates session state
Fixed bug where DataFilters didn't work with line chart grouping
feature.
Simplified some dependency code using lazy validation.

Signed-off-by: Andy Dufilie <andy.dufilie@gmail.com>
Merge remote-tracking branch 'origin/master' into individual-record