log fix

fixed a log bug where two users with similar ids werent parsed correctly
comment link fix

fixed a bug where you couldnt link persons in comments when starting the comment with the link
timeline username fix

fixed a bug where a strange username was displayed for unregistered and deleted users on the timeline - closes #159
tag fixes

tags left in the input field are now added as well (closes #158); you can now link tags in comments with #tag