Update dmdirc-plugins to head
Remove twitter4j repository
Remove twitter command

Update nb files to 7
Remove dmdirc-plugins external
Add new DMDirc plugins repo
Lots of hacking to bring up-to-date with latest version
Remove dependency on DMDirc client, fix bits and pieces
Disable broken commands and add support for DMDirc JIRA
Add issue search command
Update submodules to point to public repos
Tidying