Synopsis
		sfpclipc2 < in.rsf > out.rsf upclip=99 lpclip=0

For example:
A=1,2,3,...,100
sfpclipc2 upclip=98 lpclip=3
A'=3,3,3,...,98,98,98

Parameters
		float lpclip=0 percentile lower cliping value   float upclip=99 percentile upper cliping value