Archiver Appliance Updates & DataBrowser Import/Export

1. Implemented min, max and count data loading in Archive Appliance (requires the latest archiver appliance server). By default the optimized data are loaded as ArchiveVStatistics (min, max, std, mean, count) - this is settable through preferences.ini. See the help page for more details.
2. Implemented more extensive junit tests for the appliance.
3. Fixed the "Einstein bug" in the data browser, when last data point in the trend could have an earlier timestamp resulting in the trendline being plotted backwards. I was only able to reproduce this issue if my live PV got disconnected. 
4. Fixed the importing of the data into DataBrowser. The previous version did not take into account grouping and decimal separators, the new one does. It is also possible to import min/max values.