SURESAMP - Resample in time					

 suresamp <stdin >stdout  [optional parameters]		

 Required parameters:						
	none							

 Optional Parameters:						
	nt=tr.ns	    number of time samples on output	
	dt=tr.dt/10^6	    time sampling interval on output	
	tmin=tr.delrt/10^3  first time sample on output		

 Example 1: (assume original data had dt=.004 nt=256)		
 	sufilter <data f=40,50 amps=1.,0. | 			
 	suresamp nt=128 dt=.008 | ...		 		
 Note the typical anti-alias filtering before sub-sampling.	
 Example 2: (assume original data had dt=.004 nt=256)		
 	suresamp <data nt=512 dt=.002 | ...	 		

 Credits:
	CWP: Dave (resamp algorithm), Jack (SU adaptation)

 Trace header fields accessed:  ns, dt, delrt
 Trace header fields modified:  ns, dt, delrt(only, when set tmin)