Implemented #467 Journal logs comments on changesets - added created/updated user action to journal - added created/updated users group action journal - added ip adresses to most of action_log calls to track IP changes - rewrote action_parser to simpler and more efficient solution

## this is a dummy html file for partial rendering on server and sending
## generated output via ajax after comment submit
<%namespace name="comment" file="/changeset/changeset_file_comment.html"/>
${comment.comment_block(c.co)}