Convert capture history DATA.FRAME into the 'SNRinfo' format used by the callDensity package
Source:R/callDensitySupport.R
capHistTosnrInfo.RdDeprecated. A thin wrapper around chtToSNRinfo,
kept so the published Common Ground and Beyond Counting Calls analyses
keep reproducing exactly against current main. New code should
call chtToSNRinfo directly.