Script for making infiles

Python script used for making infiles for RAxML, MrBayes, and *BEAST analyses. Input is a nexus file with a MrBayes block appended; output are infiles for: RAxML with randomly-chosen allele for nuclear loci, MrBayes files for gene tree analyses with either all alleles or randomly-chosen allele for heterozygotes; *BEAST files with either all alleles or randomly-chosen allele for heterozygotes