* insettabular.[Ch]: remove remains of the 'update' mechanism,

	* insettabular.[Ch]: remove remains of the 'update' mechanism,
	  simplify cursor moving function,
	  re-enable horizontal scrolling for large tables

	* insetbase.C:
	* insetbase.[Ch]: remove explicit 'DispatchResult' return type and
	  implicitly assume 'DispatchResult(true, true) with exception of
	  InsetBase::priv_dispatch which does the equivalent of
	  'retrun DispatchResult(false)'

	* inset*.[Ch] (priv_dispatch): adjust

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@8435 a592a061-630c-0410-9148-cb99ea01b6c8