Changed SavedUserVdots and UserVdot API so the default flag is not stored within a VDOT anymore, it's not stored in the store itself.  This prevents multiple VDOTs from being marked as the default.  Also updated the benchmark page to allow saving of VDOTs (the first one will be marked as default, the rest will not).
Override property setter for defaultUuid so that it checks to see if the uuid is valid, and if so, forces a save to disk
implemented a brute force reload of the saved user vdot table data whenever the table appears.  This may not be the most efficient way to do it, but it will work for now.
fixing some compiler warnings
Updated version string for upload to TestFlight