Fixed problem with processing multiple .sff files

The replacement of the 10bp associated with the barcode did not have the
primer tacked on, which meant there was a higher probability a 10bp
stretch within a given sequence might accidentally be replaced. The
addition of the 8bp primer stretch essentially nullifies that
probability.
Merge remote-tracking branch 'origin/master'

Conflicts:
	MOTHUR_16S_PIPELINE.py