[ticket/9550] Add template event memberlist_view_column2_details_append

Adds the append counterpart of a template event required for the karma
extension. It allows adding entries to the column2 part of any user profile.

Explanation from http://area51.phpbb.com/phpBB/viewtopic.php?f=111&t=44379:
Per suggestion of nickvergessen, add a counterpart for every append or prepend
event.

PHPBB3-9550
[ticket/9550] Add template event viewtopic_body_top_profile_icons_append

Adds a template event required for the karma extension. It allows adding
profile icons to posts.

Explanation from http://area51.phpbb.com/phpBB/viewtopic.php?f=111&t=44379:
Used by the karma extension to add thumbs up/down icons that allow users to
give karma on posts. Note: this event's name specifies _top_profile_icons_
because there is another <ul class="profile-icons"> on the right of every
post.

PHPBB3-9550