core/affectanalyser.cpp: .getMaximum(), further simplify main test
The condition on ratioMin is now strict (the default ratioMin is now 1.9 instead of 2.0), and obscure conditions are removed. A few borderline cases could now pass here (max_found), but they should anyway be discarded by the following e-values tests (and yield the same unsegmentation cause than before). The whole test is now cleaner and more symmetrical.
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