fixed issue #64 "Plot Style Line Size (1pt already huge)". Solution wasQPen::setCosmetic(True) for using scale-independent line-width

added @qgsfunctions plotStyleSymbolFillColor and plotStyleSymbol. this allows to synchronize th eplot visualization with the layer visualization of the Spectral Library

added SpectralLibraryTableFilterModel

SpectralLibraryWidget (wip)

plotstyling.py now uses OptionModels

pixelloader.py - loads from valid band-indices only
profilevisualization.py - refactoring, added exampleLyr(sensor)
   several changes related to 3D plotting: added ViewWidget3D(), TemporalProfile3DPlotStyle(PlotStyle), PlotSettingsModel3D(QAbstractTableModel)

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

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)

added # -*- coding: uft-8 -*-   and  # noinspection PyPep8Naming to each module
added GPL License statement to each module
added from __future__ import absolute_import to each module

SensorPlotStyle get restored
PixelLoader.py: CRS transformation in pure GDAL due to problems with QgsCoordinateTransformation in non-main thread
utils.geo2px() now casts geo2pxF coordinates to integer (instead of rounding them)

faster plot style updates