Added two new systemtest in Spectrum. test_deselect_sn_ratio_all and test_deselect_sn_ratio_any.
These test the user function deselect.sn_ratio, to deselect spins with a signal to noise ratio lower than the specified ratio.
Authored by: tlinnet 2014-12-07
Parent: [r26981]
Child: [r26983]
