pullrequest overview: add delete button to own pull requests In anticipation of the re-use of the pullrequest overview to display 'my pullrequests', add a delete button to all pullrequests owned by the currently logged-in user. An explicit width is added to the column because the column is otherwise unnecessarily large.

.. _changelog:

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Changelog
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Kallithea project doesn't keep its changelog here.  We refer you to our Mercurial logs_ .

.. _logs: https://kallithea-scm.org/repos/kallithea/changelog