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Merge pull request #18 from DexcTrack/dexMerge1

Update for newer releases of matplotlib, datetime.

Avoid No Such Table exception for first annotation

Adding try/except to calcStats()

Hide slider handles and improve MacOs screensize

Adding support for QtAgg backend

Fixing bug in Note display

Adding black edge around Legend

Make sure future curves are dashed

Offset dashed lines to avoid eclipsing

Update README.md

Update README.md