Updates to Data Watcher and Battery Watcher

I just released new versions for both of the above.  It's now possible to

• disable usage and error reporting via the settings screen of both apps
• select between KB and KiB in the Data Watcher.

I also improved the number formatting in the Data Watcher to always use 3 digits of precision.  So 101,000B is now displayed as 101k, not as 0.1M, as it was before.