Account Tracker / Hill Lists / Meter Readings

Improvements to the budgets screen, in particular I have made it a bit more intuitive when adding and removing budgets. Note that more changes will be coming in this area.

By popular request, added support for re-ordering groups in the settings.

Performance improvements, especially when dealing with large numbers of transactions.

Shortened the getting started tour, as it was a bit too long.

Minor bug fixes and UI changes.