* Created _scroll extension point and migrated scroll code from _mouseDrag
* Cleaned up logic for scrolled
* Fixed appendTo functionality to match documentation
* Remove unnecessary function calls
* Move set-up position functions to appropriate place
* Base scrollParent on placeholder and not helper
* Update scrollParent when switching containers

* Fixed misplaced merge lines

* Fixed code style issues

* Fixed code style issue

* Removed scrollParent placeholder basis due to unknown difference between local copy and pushed copy functionality

* Fixed merge issue with position of _getParentOffset() and reinstated scrollParent based on placeholder

* Restored _mouseDrag call from _mouseStart

* Fix item intersection after scroll

* Update offset as well when moving from sortable with no scrollbar to a sortable with scroll bar
* No need to process mouse drag if not in a container

* Missing update of absolute position left component via scroll action

* Scroll values were slightly different from offset values for items so reverted to using offset to update item positions after scroll
* Created entry for dragDirection to reduce superflous function calls
* Removed unneeded code give fix-up for offsetParent

* Worked refreshItemPositions function into existing refreshPosition function