Add --min-allele-freq argument to build command

[sm0179]

add --min_freq arg to build step to be passed to the vcf_to_linear_prg script, for filtering variants in the vcf by allele frequency when constructing the linear PRG

[ffranr]

@sm0179 What is the use case for this feature?

[sm0179]

the vcf_to_linear_prg script has an option to exclude from the PRG build process variants that occur in the population under a specified frequency (min_freq). this is because sometimes we want only a PRG with common variants. this is all already functional, we just need the build cmd to pass this argument when it calls the vcf_to_linear_prg script

[ffranr]

That make sense, thank you for clarifying. May I suggest: --min-allele-freq

[sm0179]

definitely