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Casey Dunn committed 0de506c

added argument re #49

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agalma/sanitize.py

 pipe.add_argument('quality', short='q', type=int, metavar='MIN',
 	default=28, help="""
 	Filter out reads that have a mean quality < MIN.""")
+	
+pipe.add_argument('number', short='n', type=int, metavar='NUM',
+	default=None, help="""
+	Consider only the first NUM reads that pass filter, others are discarded""")
 
 # Pipeline stages.