Merge branches 'develop' and 'feature/bugfixes' of https://bitbucket.org/jakimowb/eo-time-series-viewer into feature/bugfixes

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

(button to delete Qgsfields is enabled only in case none-standard fields exist)

speclib + temporal profile layers invisible to QGIS (for security reasons)

wip temporal profile saving

fixed Temporal profile expression evaluation

TemporalProfileCollection is now an in-memory TemporalProfileLayer(QgsVectorLayer)
added TemporalProfileTableModel, TemporalProfileTableFilterModel, TemporalProfileFeatureSelectionManager, TemporalProfileTableView

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

added default spectrum for spectral libraries

improved speclib CSV export

Speclib MIMEDATA Handling

added ClipboardIO(AbstractSpectralLibraryIO) to write/read Speclibs from Clipboard