modified documentation:
- changelog.rst for comprehensive listing,
- changelog_visual.rst for visual comparision
- changes with external link to issues visible in AboutDialogUI and sphinx documentation

Signed-off-by: benjamin.jakimow <benjamin.jakimow@geo.hu-berlin.de>

Settings: added MapImageExportDirectory key
TimeSeriesViewer: added exportMapsToImages() and SaveAllMapsDialog() to
save all maps for each MapView

Signed-off-by: benjamin.jakimow <benjamin.jakimow@geo.hu-berlin.de>

Signed-off-by: benjamin.jakimow <benjamin.jakimow@geo.hu-berlin.de>

Signed-off-by: Benjamin Jakimow <benjamin.jakimow@geo.hu-berlin.de>

improved about text
added "add vector layer" button to map view control

Signed-off-by: benjamin.jakimow <benjamin.jakimow@geo.hu-berlin.de>

Signed-off-by: benjamin.jakimow <benjamin.jakimow@geo.hu-berlin.de>

LabelingDock: can now be initialized on external QgsMapCanvas

added TimeSeriesDockUI.showTSD()

Signed-off-by: benjamin.jakimow <benjamin.jakimow@geo.hu-berlin.de>

Signed-off-by: benjamin.jakimow <benjamin.jakimow@geo.hu-berlin.de>

fixed bug in vector layer visualization
pulled qps updates

.gitignore knows enmapboxtestdata
fixed several missing references

fixes issue #76 - uses original QGOS raster renderer widgets only (to be improved)

- added MapCanvasLayerModel, MapCanvas.Command, multi-raster-layer support
- implemented refresh pipeline for timed updates
- QMenu shows Crosshair visibility, fixed some api bugs
- added setSpatialExtent, setSpatialCenter
- spatialExtentHint considers all layers

TimeSeriesViewer:
- added showTimeSeriesDatum fpor scrolling to TSD of interest

TimeSeries + TimeSeriesTableModel + panel:
- support multiple raster per date
- QSortProxyModel allows sorting

utils.py
- added some more TestObject functions

make.py
- resource.py compilation is now python-only.
refactoring + docstrings

added WCS support
added TimeSeriesDataSource
allows to use multiple source per TSD

refactoring
added timeseriesviewertesting and moved tests to