0.4.0a1

##Alpha release of tsinfer 0.4.0

Features

• tsinfer now supports inferring data from an vcf-zarr dataset. This allows users
  to infer from VCFs via the optimised and parallel VCF parsing in bio2zarr.
• The VariantData class can be used to load the vcf-data and be used for inference.
• vcf-zarr sample_ids are inserted into individual metadata as variant_data_sample_id
  if this key does not already exist.

Breaking Changes

• Remove the uuid field from SampleData. SampleData equality is now purely based
  on data. ({pr}748, {user}benjeffery)

Performance improvements

• Reduce memory usage when running match_samples against large cohorts
  containing sequences with substantial amounts of error.
  ({pr}761, {user}jeromekelleher)

• truncate_ancestors no longer requires loading all the ancestors into RAM.
  ({pr}811, {user}benjeffery)

• Reduce memory requirements of the generate_ancestors function by providing
  the genotype_encoding ({pr}809) and mmap_temp_dir ({pr}808) options
  ({user}jeromekelleher).

• Increase parallelisation of match_ancestors by generating parallel groups from
  their implied dependency graph. ({pr}828, {issue}147, {user}benjeffery)