[vcf] replace augur's read_vcf with TreeTime's #1366
Merged
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The strain names are available from TreeTime's function of the same name. This function is preferable to (a) reduce duplicated logic and (b) because it performs more thorough validation of the VCF file.
Aside: Augur's
read_vcf
function (which has moved around quite a lot) was first introduced by 278a30e in May2018. This returned a tuple of
(strain_names, strain_names.copy())
and this return signature has been kept during refactors despite us having since stopped using the second argument, except for in tests!Closes #1357