Detect Periods of Sleep and Non-Wear in 'ActiGraph' Data // Reads *.agd files exported from 'ActiGraph' devices; implements the Troiano (2008) doi:10.1249/mss.0b013e31815a51b3 and Choi (2011) doi:10.1249/MSS.0b013e3181ed61a3 algorithms for detecting periods on non-wear; implements the Sadeh (1994) doi:10.1093/sleep/17.3.201 and Cole-Kripke (1992) doi:10.1093/sleep/15.5.461 algorithms for detecting asleep/awake state and the Tudor-Locke (2014) doi:10.1139/apnm-2013-0173 algorithm to detect sleep periods from asleep/awake states.