utils.py added loadIcon()
mapvisualization.py implemented MapCanvas loading activity bar

TimeSeriesTableView context menu allows to check/uncheck selected rows and to hide/show the related observations
TimeSeriesTableView context menu allows to copy values of selected cells to the clipboard

added TimeSeriesTableView, started to implement contextMenu...

improved QGIS interaction
several UI issues and smaler bugs fixed

class ImageDateParser to be inherited by data-set specific date-time-group parsers
class ImageDataParserLandsat(ImageDateParser) to extract date-time-groups from Landsat like data-sets (SceneID / ProductID)

faster TSD loading initialization
removed "mask" column in TimeSeriesTable model
added debugstatus.ui

sensors have a static id
sensors have a variable name (sensor.setName()). name changes are propagated to other components
sensor table view allows to change sensor name and shows wavelength information

implemented  DateAxis logic
renamed PlotDataItem to SensorPoints
renamed PixelCollection.clear() to PixelCollection.clearPixels()
PlotSettingsModel signals sigVisibilityChanged  and sigDataChanged
date2num and num2date for (almost) consistent conversions between numpy.datetime64 and integers

added convenience functions TimeSeries.tsdFromPath(), TimeSeries.getTSD(), getDateFromDOY(), getDOYFromDate()

TimeSeriesDatum: .createFromPath() (static), sigVisibilityChanged

minor fixes

minor UI changes

action based event handling

uses QgsRasterLayers