Add meta-history bug link expansion

Instead of

Some User 2013-12-22 18:12:22 CET
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Depends on: 58866

Show

Some User 2013-12-22 18:12:22 CET
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Depends on: 58866 - RESOLVED FIXED - Migrate http://toolserver.org/~artem/ru_wikinews_rss.xml to Tool Labs

If multiple depends-on links were added, newlines are added, and the output becomes

Bartosz Dziewoński 2014-02-11 14:02:58 CET
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Depends on:
61188 - NEW - Migrate https://toolserver.org/~magnus/coord_gen.php,
61191 - NEW - Migrate https://toolserver.org/~magnus/missing_links.php,
61193 - NEW - Migrate https://toolserver.org/~magnus/redirector.php

Change-Id: Iddda21c8764049270d09178b258dd6b255ce660f