pullrequest overview: display in table to improve readability Instead of showing all info in the pullrequest overview right after each other on the same line, use a table to improve readability. Additionally, add following information: - author - destination repository The latter is always the same when viewing the list of pullrequests of a certain repository, but this change already anticipates re-use of this block in the 'my pullrequests' overview. The table is still static, non-sortable, since YUI is deprecated and no new alternative has been decided upon yet. This improvement can be done later.