* lisp/org-colview.el (org-dblock-write:column view): Factor out the
existing formatting code to new function
`org-columns-dblock-write-default', and honour new dblock parameter
:formatter for specifying a different formatting function.
(org-columns-dblock-write-default): New function with current
formatting code.
(org-columns--capture-view): Amend docstring to better explain the
format of the data being passed to the formatting function.
(org-clock-clocktable-formatter): New option to define a global
default formatting function, defaulting to the current behaviour.
* testing/lisp/test-org-colview.el (test-org-colview/dblock): New test
for formatting function.
(test-org-colview/dblock-formatter): New function used in formatting
test.
* doc/org-manual.org (Capturing column view): Describe new :formatter
parameter.
* etc/ORG-NEWS (New option ~org-columns-dblock-formatter~): Announce
new option.
(=colview= dynamic block supports custom formatting function):
Describe new custom formatting function feature.
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