added default spectrum for spectral libraries

refactoring MapView dock

Opens vector files, which will be loaded into the MapLayerRegistry and become available in the MapLayers widget.

FileOpen dialog uses QGIS-like raster / vector file file filters (fixes #28)

fixed Issue #42

fixed temporal profile visualization

SpectralLibraryWidget (wip)

profilevisualization: UI refactoring, UI title-updates, profile-request action connected with MapTool in main UI,
started to implemente saveTemporalProfiles actions

SEVERAL CHANGES TO TEMPORAL PROFILE VISUALIZATION
+ dynamic data loading
+ free choice of TemporalProfiles
+ removed dependency to in-memory QgsVectorLayer

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

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)

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