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This pull request addresses a major issue that has been affecting us when we run Lofreq on whole genome data in somatic mode. Non-ACTGN characters in the reference (e.g. IUPAC ambiguity codes such as W, R, Y) cause strange behaviour and lead to malformed/garbled lines in the VCF somewhat consistently (see #106). The change to plp.c forces these positions to be ignored as it does for Ns in the reference. We have also changed merging to rely on bcftools in an earlier attempt to address this issue (see #108). That change may not be necessary at this point with the current patch to plp.c
I'm interested in having at least the plp.c change added to future releases of lofreq so conda users can benefit from this improvement.