#1577 - Manual move handler moved outside of THs
#1576 - Fix for move handler not appearing in the right place after the table has been scrolled + test
bugfix: `afterOnCellMouseOver` plugin hook is now called also for row/column headers
Merge branch 'feature/issue-1576' into develop

Conflicts:
	demo/column_move.html
	src/css/jquery.handsontable.css