Steps to get BTT running

1find appropriate span value for detrending the profile
2select span values closest to the bedform length of interest
3run BTT with the found span values (Ps2) and the bedform lengths of interest (EstBL)
	this are input values of the main BDT script (Ps2 in second parameter of moving mean fucntion, EstBL is fourth parameter of FindCrossings function). Both adaptable in BDT script or via RunBTT_Sjoukje_new

corresponding scripts:
1. DetermineP0_Sjoukje
2. find_best_P0.m
3. runBTT_Sjoukje_new.m