added new Icons

virtualrasters.py : added feature identify to preview map

added several functions to virtualrasters.py: CRs handling, internal CRS warping (VRT based), bound handling,...

added classificationscheme.py
utils.py added value2str
added vrtbuilder.ui
virtualrasters: multiple changes (in progress) related to vrtbuilder.ui

refactoring

added __main__.py (in progress)
added option to load center pixel automatically

added sitepackages/update.sh to update external dependency

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

# Conflicts:
#	timeseriesviewer/pixelloader.py

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

utils.py added loadIcon()
mapvisualization.py implemented MapCanvas loading activity bar

TimeSeriesTableView context menu allows to check/uncheck selected rows and to hide/show the related observations
TimeSeriesTableView context menu allows to copy values of selected cells to the clipboard

added TimeSeriesTableView, started to implement contextMenu...

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