org-agenda.el: New option `org-agenda-use-tag-inheritance'

org-agenda.el: New option `org-agenda-use-tag-inheritance'

* org-agenda.el (org-search-view, org-agenda-get-todos)
(org-agenda-get-timestamps, org-agenda-get-sexps)
(org-agenda-get-progress, org-agenda-get-deadlines)
(org-agenda-get-scheduled, org-agenda-get-blocks)
(org-agenda-change-all-lines): Get local tags only.
(org-agenda-use-tag-inheritance): New option.
(org-agenda-finalize): When `org-agenda-use-tag-inheritance'
is non-nil, possibly reset tags in the agenda buffer.
(org-agenda-check-type): Enhance docstring.

See the docstring of the new option for details.