Merge SV VCFs

This set of routines merges SV VCF files by calls, labeling calls by the callers that made them in an INFO field, Callers=. Most of the work goes into normalizing SV calls, which are treated as paired of breakpoints that are equal if they fall within a user-specified window.

Known Issues

• INFO and FORMAT merged for multiple from same caller with only be for last record
• Individual Caller Genotype not kept