v1.5.r0

• Caching of discordant read pairs during SV identification to reduce lookups on bam file. This gives a speedup of about 2x on average, but likely better returns on samples with incredibly large numbers of SVs.
• Optimizations to fetching of downsampled reads (alters results slightly as randomness of downsampled reads is updated)
• Optimization to intersection detection implemented in AA. Results in a small speedup.
• Add support for parsing of SV VCF generated in GRIDSS having extra column for normal.
• Logging improvements
• Typo fixes (PR by cmdcolin)