Ripples: Added Ripples plug-in for publishing real-time state to the
web.
[BathymLayer] Added layer that displays area covered by Multibeam sonar.
[BathymetryLayer] Now accounting with current tide level.
[TidePanel] Added simple plugin that displays the tide level prediction
for the day.
BathymetryLayer: By default, current image will be stored in log/ and
loaded next time.
[Tide Prediction] Added methods for retrieving current tide level.
[Tides] If Tides file preference is changed, tides cache gets updated.