SUADDHEAD - put headers on bare traces and set the tracl and ns fields

 suaddhead <stdin >stdout ns= ftn=0					

 Required parameter:							
 	ns=the number of samples per trace				

 Optional parameter:							
 	ftn=0		Fortran flag					
 			0 = data written unformatted from C		
 			1 = data written unformatted from Fortran	

 Trace header fields set: ns, tracl					
 Use sushw/suchw to set other needed fields.				

 Caution: An incorrect ns field will munge subsequent processing.	
 Note:    n1 and nt are acceptable aliases for ns.			

 Example:								
 suaddhead ns=1024 <bare_traces | sushw key=dt a=4000 >segy_traces	

 This command line adds headers with ns=1024 samples.  The second part	
 of the pipe sets the trace header field dt to 4 ms.			


 Credits:
	SEP: Einar Kjartansson
	CWP: Jack K. Cohen

 Trace header fields set: ns, tracl