only show 'active' users
- users which require 0 Byte are ignored
- useful when dealing with LDAP and lots of users who have never logged in
change the hight of charts from 320px to 520px
- much nicer especially when browser is not fullscreen
remove stupid debugging stuff...
Merge pull request #18 from miicha/Branch_56f05f29a2c339db98029dc2ac7686b937898cac

Visual improvements