Demo updates for further simplification
Demo : Infosthetics minor update
itemName chart parameter is now optional

By default, it is set to the first sheet name in data source.
Minor Demo updates
Gradient-25 option added
Simplification: catItemMap & filter text options are now optional
timeItemMap is now an optional facet config setting
Simplifcation for common sorting options + other demo simplifications
Now config option: timeBarShow

+ few small bug/demo fixes