FIX of SSAMetadataPanel - refactoring

Credits: Margarida Castro Neves

See https://github.com/and146/SPLAT-
ARI/commit/c62c2f6ae0655e30fc81c027d33b5e11d2545ecb
Added 'Save ranges' to the Analysis menu

Added 'Save ranges' functionality to the Analysis - Cut regions from
spectrum (until now it was available only programmatically)