[PATCH 0 of 5 v2] (my) pullrequest overview: line-up and sanitize style (+misc changes)

[Thomas De Schampheleire]

Hi, 

This patch series is a first step in improving the pull request overviews
(both 'my' and 'repo' overviews).

The next step is to improve the way data is displayed:
- use a fixed order of fields for each PR (curiously enough, on the 'my
  pullrequests' page, the order of fields is different for the 'created by
  me' and 'I paricipate in' lists)
- improve readability by displaying the data in a table, rather than
  word-after-word.
- add other useful data in the table, like the owner of the pull request.

In v2:
- rework my fixes wrt rendering templates in context variables, and expand
  to all such usage in Kallithea
- fix issue #102 in the third patch
- add a trivial patch to remove an unused CSS class


Best regards,
Thomas