corrected test
fixed bamliquidator bin possible no-null terminated strings
corrected test
corrected region liquidation possible non-null terminated strings
removed no longer needed max_lengthed_string func
removed no longer needed stderr suppression

this was just added in because previously a bad region would cause samtools to write to stderr,
which could clog up output.  but now we check the region before calling samtools, so we
shouldn't run into this case anymore.  if samtools does error despite the check, bamliquidator halts,
and writing to stderr here is ok