Replacing Typeahead by Select2

User CP - Edit Lists
Select2 JS + CSS
Fixes Quick Edit and Quick Reply bugs
Not necessary to sanitize message

It seems Jeditable already sanitizes it when it grabs the data from
xmlhttp.php and puts it into the editable field - "content" would become
&amp;quot;content&amp;quot; instead of "content" in the text area.
Improve user overview

 - Adds extra number formatting to post count/posts per day.
 - Shows both time and date for user's local time.
Fixes incorrect regex
Merge remote-tracking branch 'upstream/feature' into test