Revising collapsible support for horizontal sections.
Moving styles from SCiCustomer
Adding padding for header children
Moving subscribe to hsection
Clean up subscriptions when destroying element.
using javascript for sliding, allows content to slide in sync
Provide javascript sliding for horizontal panels
Compensate for shrinking of this section due to a parent section expanding
Checks for null dom elements
Merge pull request #234 from PrimeRevenue/bug/collapsing_panels_right_partially_hidden

Bug/collapsing panels right partially hidden