Fix Datable range flag methods
add date() method, for ensure 00:00:00
Datable: add js-related DateTime mutators
add _class() utility to class-configurable components
make daterange picker timezone-independent
Rewrite configuration of Sources in Reports, alpha
Clean up code, todo, remove SourceConfig::type
Fix Datable range errors
Improve Datable::date() preformance
Fix possible Datable bugs
Add copy() method to chain-cloning