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
