profile visualization: fixed TP loading status, added TP ContextMenu

fixed Issue #42

refactoring

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

default colors for new sensor 2D/3D profiles different to existing sensor colors.

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)

profilevisualization: date2num num2date now based on decimalyear values

profilevisualization.py refactoring, added TemporalProfile.plot()

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)

added SensorPixelDataMemoryLayer

added PixelLoaderResult(object)
adjusted TSV icon
changed test_pixelloader.py