Libellus Potionis 0.81.0

New accessibility options. The capacity indicator can now show a shape (cross, 1 or arrow) in addition to its colour — enable it under Settings → Appearance to help with red–green colour-vision deficiency. The statistics charts now provide a text description for screen readers. Also fixed: trend, monthly average and PDF abstinence figures now respect the statistics start date and the report period; date-picker timezone fix.