Auto enumerate Spectral Library Window names in Data Views (similar to Map Views)

[Fabian Thiel]

With regard to the Spectral Profile Sources Menu it would make sense to name the speclib windows similar to the map views (Spectral Library #1, Spectral Library #2)

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[Benjamin Jakimow]

closes issue #302 - Spectra Library Windows get named like Map Windows

Signed-off-by: benjamin.jakimow [e-mail]

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