sensitivity improvements

NOTE: there is a change to svtyper that we found in evaluating smoove that will reduce the FPR from genotyping. Please update to svtyper>0.6.0 for best results.

v0.1.5

• sensitivity increases for variants without split reads.
• use a fixed length of 4 in merge (gives much better merging for smoove merge)
• add new annotate command which takes a gff and annotates with gene names
• increase max_reads argument to svtyper to reduce false negatives
• remove QCFail and duplicate reads from split and disc.bams. This is now
  part of smoove but also fixed in lumpy_filter upstream.