added ability to read in char sets from a nexus file that only take every k'th site
added ability to read in char sets from a nexus file that only take every k'th site
evolvedmicrobe/beast-mcmc,danieljue/beast-mcmc,danieljue/beast-mcmc,danieljue/beast-mcmc,danieljue/beast-mcmc,evolvedmicrobe/beast-mcmc,evolvedmicrobe/beast-mcmc,danieljue/beast-mcmc,evolvedmicrobe/beast-mcmc,evolvedmicrobe/beast-mcmc