manta-0.13.0

• MANTA-63 Incorporate read-pair evidence into small SVs/indels
• MANTA-77 Fix assertion for rna-seq test
• MANTA-17 Include semi-aligned reads in discovery and scoring
• MANTA-69 Update score/write filter to account for CIGAR and SA-read
  candidates, and new uniform candidate scheme for self-edges.
• MANTA-70 Correct filters to allow for small inversion and tandem dup
  detection
• MANTA-68 SVLEN not set correctly for non-deletions
• MANTA-64 Improve candidate generation for small regions
• MANTA-43 allow manta installation to be relocated
• MANTA-55 compile python code as part of build/install