* org.el (org-todo): Return correct state type even if the blocker
throws an error.
(org-modifier-cursor-error): Renamed from
`org-shiftcursor-error'.
(org-shiftmetaleft, org-shiftmetaright, org-shiftmetaup)
(org-shiftmetadown): Call `org-modifier-cursor-error'.
* org-agenda.el (org-agenda-todo): Call `org-todo' interactively,
to get real errors from the blocker hook.
* org.el (org-shiftselect-error, org-call-for-shift-select): New
functions.
(org-set-visibility-according-to-property): Turn off the setting
of `org-show-entry-below', to avoid overruling a FOLDED visibility
property.
* org.el (org-support-shift-select): New option.
(org-shiftup, org-shiftdown, org-shiftright, org-shiftleft)
(org-shiftcontrolright, org-shiftcontrolleft): Support for shift
selection outside contexts.
* org-list.el (org-at-item-bullet-p): New function.