Added more extensive unit tests.
Fixed a few bugs discovered by unit testing.
Bugfix: in some situations history samples can have later timestamps than live samples (e.g. when PV is disconnected or updating really slowly). This may result in the trend line being plotted back in time.
Bugfix: The regular expression was updated to include the grouping separator (,) and parsing of number has been updated to properly parse numbers in format 432,432.443.
Implemented loading of min, max and count values.
Load min and max values if they are present.
Added the statistical property description to help.
Merge remote-tracking branch 'upstream/master'
Another attempt at fighting the "Einstein bug".
Merge pull request #396 from jbobnar/master

Archiver Appliance Updates & DataBrowser Import/Export
Merge remote-tracking branch 'origin/master' into sns