SpeclibViewer Widget with full vector edit functionality

[Benjamin Jakimow]

use qps attribute table widget to realize vector editing functions in Speclib Viewer

[Benjamin Jakimow]

qps updates closes #494 (SpeclibViewer provided better vector editing capabilities and is now based on qps AttributeTableWidget) closes #500 number of profiles shown in plot can be increased to higher numbers (which will slow down everything, however, the user can have it) closes #493 changed SpectralLibraryPlotWidget default selection behaviour: no key / + CTRL selected profiles, +ALT selects data point

Signed-off-by: Benjamin Jakimow [e-mail] [e-mail]

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