Synopsis
		sflpf < dat.rsf match=mat.rsf > flt.rsf pred=pre.rsf niter=100 verb=y pef= lag=

July 2019 program of the month:
http://ahay.org/blog/2019/07/09/program-of-the-month-sflpf/

Parameters
		string lag= file with PEF lags (optional)   file match= auxiliary input file name   int niter=100 number of iterations   string pef= signal PEF file (optional)   string pred= auxiliary output file name   bool verb=y [y/n] verbosity flag