updates to virtualrasters.py

https://github.com/pyinstaller/pyinstaller/wiki/Recipe-Multiprocessing

fixed map rendering error: changes in mapview & sensor specific render settings will be applied also on non-visible QgsMapCanvases

utils.py refactoring (loadUi -> loadUI, affects many widget classes)

added cursorlocationvalue.py + panel
added spectrallibraries.py + panel
added a couple of new icons
added trees.py (basic TreeModel system)

TimeSeriesViewer inherits QgisInterface
refactoring maptools
 - added mapcanvas.MapTools
 - TimeSeriesviewer.onShowProfile handles location based maptool requests (CursorLocation, Temproal/spectral prpofiles)

# Conflicts:
#	timeseriesviewer/ui/icons/ActionIdentifyTimeSeries.png
#	timeseriesviewer/ui/icons/CRS.png
#	timeseriesviewer/ui/icons/IconTimeSeries.png
#	timeseriesviewer/ui/icons/copyright_label.png
#	timeseriesviewer/ui/icons/general.png
#	timeseriesviewer/ui/icons/icon.png
#	timeseriesviewer/ui/icons/locked.png
#	timeseriesviewer/ui/icons/lockedGray.png
#	timeseriesviewer/ui/icons/mActionAdd.png
#	timeseriesviewer/ui/icons/mActionAddMapView.png
#	timeseriesviewer/ui/icons/mActionAddRasterLayer.png
#	timeseriesviewer/ui/icons/mActionAddTS.png
#	timeseriesviewer/ui/icons/mActionAtlasFirst.png
#	timeseriesviewer/ui/icons/mActionAtlasLast.png
#	timeseriesviewer/ui/icons/mActionAtlasNext.png
#	timeseriesviewer/ui/icons/mActionAtlasPrev.png
#	timeseriesviewer/ui/icons/mActionEditCopy.png
#	timeseriesviewer/ui/icons/mActionEditPaste.png
#	timeseriesviewer/ui/icons/mActionFileSave.png
#	timeseriesviewer/ui/icons/mActionFileSaveAs.png
#	timeseriesviewer/ui/icons/mActionIdentify.png
#	timeseriesviewer/ui/icons/mActionPan.png
#	timeseriesviewer/ui/icons/mActionRemove.png
#	timeseriesviewer/ui/icons/mActionRemoveMapView.png
#	timeseriesviewer/ui/icons/mActionRemoveTS.png
#	timeseriesviewer/ui/icons/mActionRemoveTSD.png
#	timeseriesviewer/ui/icons/mActionSaveTS.png
#	timeseriesviewer/ui/icons/mActionShowAllLayers.png
#	timeseriesviewer/ui/icons/mActionZoomActual.png
#	timeseriesviewer/ui/icons/mActionZoomFullExtent.png
#	timeseriesviewer/ui/icons/mActionZoomIn.png
#	timeseriesviewer/ui/icons/mActionZoomOut.png
#	timeseriesviewer/ui/icons/mActionZoomPoint.png
#	timeseriesviewer/ui/icons/mActionZoomToArea.png
#	timeseriesviewer/ui/icons/mActionZoomToLayer.png
#	timeseriesviewer/ui/icons/mActionZoomToSelected.png
#	timeseriesviewer/ui/icons/mIconClear.png
#	timeseriesviewer/ui/icons/mIconClearText.png
#	timeseriesviewer/ui/icons/mIconClose.png
#	timeseriesviewer/ui/icons/mIconFieldTime.png
#	timeseriesviewer/ui/icons/mapview.png
#	timeseriesviewer/ui/icons/mapviewHidden.png
#	timeseriesviewer/ui/icons/metadata.png
#	timeseriesviewer/ui/icons/qgis-icon.png
#	timeseriesviewer/ui/icons/render.png
#	timeseriesviewer/ui/icons/settings.png
#	timeseriesviewer/ui/icons/stylepreset.png
#	timeseriesviewer/ui/icons/symbology.png

solved issue #32. hub timeseriesviewe can now be started from "Raster > HUB TimeSeriesViewer"

fixed bug in mapvisualization.py

MapCanvas: used MapCanvasLayerModel that support lazy loading of QgsMapLayer instances
MapViews can have individual vector layer sources for overlay