better logger format, some comments
add people in thread in autocomplete (issue #936)
issues:
tested only in quattro theme
contacts in thread will appear twice in autocomplete popup
quattro: remove 'do not edit' comments from templates
fix photo comments: use $drop array as in wall_thread and search_item
quattro: fix photo comments, small fix to search_item template
vier: remove unused .less files, fix photo comments
Merge pull request #955 from fabrixxm/quattro_photo_comments

vier, quattro: fix photo comments
New database system that uses PDO if present/Test script for doing database upgrades.
Merge pull request #953 from tugelbend/master

Vier: Fix for the display of long text event entries
The file dba.php was missing in the last commit :) Additionally there are some chamges to the update script.
Merge remote-tracking branch 'upstream/master'
The file "dbstructure.php" was corrupted. This is the right one.
Empty template to avoid errors when installing themes.
Suppress showing unsupported addons in the administration.
The remove page now has the settings menu.
FR: update to the strings
CS: update to the strings
ZH-CN: update to the strings
NB-NO: update to the strings
FR: update to some templates