Fix so that clipping will walk back to the read start until a match is found instead of adapter_length back from the read end.
Fix so that clipping will walk back to the read start until a match is found instead of adapter_length back from the read end.

alecw/picard,annkupi/picard,nh13/picard,annkupi/picard,broadinstitute/picard,alecw/picard,nh13/picard,annkupi/picard,broadinstitute/picard,broadinstitute/picard,broadinstitute/picard,alecw/picard,broadinstitute/picard,nh13/picard,alecw/picard,annkupi/picard,nh13/picard