took a check out of mpileup
took a check out of mpileup

Mpileup doesn't produce PL values at coverage <5, without any apparent
reason.  It does now.

udo-stenzel/samtools-patched,udo-stenzel/samtools-patched,udo-stenzel/samtools-patched,mpieva/samtools-patched,udo-stenzel/samtools-patched,mpieva/samtools-patched,mpieva/samtools-patched,mpieva/samtools-patched,udo-stenzel/samtools-patched,mpieva/samtools-patched