* lisp/org-colview.el (org-columns--capture-view): Add new link
parameter, which when non-nil causes ITEM headlines to be linked to
their origins.
(org-dblock-write:columnview): Pass new link parameter to
`org-columns--capture-view', and explain its use in the docstring.
* testing/lisp/test-org-colview.el (test-org-colview/dblock): Add
new test for link feature.
* doc/org-manual.org (Capturing column view): Describe new :link
parameter.
* etc/ORG-NEWS (=colview= dynamic block can link to headlines):
Describe new link feature.
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