switching to new DB: hbprevnext, hbprevgames, hbjournal, hbdatabase

- introduces hbprevnext (for common functions of hbjournal, hbprevgames, hbnextgames)
- adjusted hbprevgames
- adjusted hbjournal
- deleted hbdatabase (not longer neede since no team specific tables anymore)
Merge branch 'master' of https://github.com/stingray21/com_hbmanager