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Version 0.7.6

Minor bugfixes and improvements.

scatter:

- Tweaked plot colors for better visibility and accessibility: points are
  slightly darker, and segments are now a deep gold color instead of red.

fix:

- Downweight targets or antitargets proportionally to their relative variability
  of bin log2 values; i.e. if targets are twice twice as variable (by
  interquartile range of bin log2 values) as antitargets, divide all target bin
  weights by 2. This happens after all bias corrections and reference
  normalization, and appears to improve the final segmentation results.

antitarget:

- Don't emit antitargets for untargeted chromosomes with long names, e.g.
  "chr6_apd_hap1" -- these are presumably alternative/unassigned contigs, not
  real canonical chromosomes that deserve to be included for CNV calling.
  But do continue to keep untargeted chromosomes with names up to the length of
  the longest-named targeted chromosome.
  (Improves on #37)
- Indicate default --min-size in help message.

batch:

- Log the number parallel processes correctly when "-p 0" is used to
  automatically detect the number of CPUs -- previously, this option would print
  on the console that samples were being run in serial, but then launch multiple
  parallel processes.

segment:

- Change --drop-outliers default from 5 to 10, based on performance in
  benchmarking.

Internally:

- Fixed detection of autosomes to be used for re-centering bin log2 values and
  detecting gender.
- Fixed parsing the GATK/Picard "interval list" file format - strand and name
  were swapped.