SparkyMK2 v0.7.2

Added

• A diagnostic log, turned on in Settings: every command the app runs, its result and
  timing, the device requests behind it and any error, written to a file to send in with
  a bug report. Open log folder shows where it is. It stays on across starts, with a new
  file each start and the last 10 kept.

Fixed

• Writes to the card wait up to 20 seconds for the unit to finish storing a file, rather
  than failing after 5, and the app runs one device operation at a time, so a status
  poll no longer lands in the middle of an import or a restore.