Fix #962: Grid docs: Revise note about renderCell/formatter
Fix #874: tree: Remove unnecessary code causing nested expansion issues
tree: Add enableTransitions column definition property
DnD: Fix issue when dragging previously-dragged row to end of grid
DnD: Prevent error in short-circuit logic on long drags

This specifically involves cases where an item is dragged a long enough
distance such that the original row is destroyed.
DnD: Cleanup

I'm a horrible person.
Minor doc fixes

Thanks @msssk for finding the issues in the OnDemand docs
Keyboard.js: do not emit dgrid-cellfocusout event when _focusOnNode is called by _restoreFocus
ColumnSet: Fix header focusing issue

When initially focusing the header with no prior context, ColumnSet
would incorrectly focus the outer `th` rather than the `th` of the
first column of data.
Keyboard: Fix error when calling focus() on an empty grid
Fix #976: Make ColumnSet scroll focused cells into view
Fix #958: editor: Don't call startup on widgets before they're in flow
README: Fix typos, improve wording, update Dojo version
Fix #977: util/misc.escapeCssId: Ensure parameter is string
Fix #765: _StoreMixin: Show noDataMessage when store is null
Fix #848: Pagination: Improve focus-related logic for navigation

* Set tabIndex to -1 on disabled navigation links
* Restore focus accordingly based on what was focused and what is now disabled
Cleanup of earlier commits today
Fix a typo
OnDemandList: Invert _calcRowHeight logic to resolve scroll glitches

The glitches manifested particularly when removeDistantNodes was run.
tree: Improve logic around rendering child levels

* Don't bother creating a preload node when not using OnDemandList
* Create preload nodes at both ends of the child level and improve code flow
* Simplify OnDemandList#renderQuery arguments (preloadNode no longer needed)