genomicSimulationC v0.2.1

This release's package improvements:

• Added function make_clones (and its genotype-generating subfunction generate_clone) to make identical duplicates of members of a group.
• Added function to randomly cross between two groups, with the option of a cap on the number of uses of each group member as a parent of a cross:
  • cross_randomly_between
• Functions split_into_individuals and split_into_families now return the groups they create.
• Added more functions for splitting groups:
  • split_into_halfsib_families
  • split_evenly_into_two
  • split_evenly_into_n
  • split_by_specific_counts_into_n
  • split_randomly_into_two
  • split_randomly_into_n
  • split_by_probabilities_into_n

Plus several minor bugfixes.