cbcb7b1ce2
A group of functionality was only used once, in TempoPoint::quarters_at_superclock . Keep things simple and enable further refactoring and cleanup by inlining everything and dropping superbeat, big_numerator and super_note_type_per_second from Tempo. The use of big_numerator right next to superclock_ticks_per_second seems error prone. It should perhaps just be refactored to work in superclock domain all the time. It seems weird that the ramped case is much simpler than the non-ramped. This (pretty much) removes the last references to "superbeat", which I thus doesn't have to understand ;-)
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