v0.2.2

This new release is a first attempt at features we will need to test some additional scenarios of secondary contact.
v0.2.2 has not yet been tested extensively, bugs are not unlikely.

New features:

• Taxon-sex specific migration rates
• Strict swamping made possible by blocking entry of taxon 2 into habitat 1
• Option to write introgression statistics and profiles at regular time intervals instead of just at the end

Bug fix:

• Rounding error with alea() allowing exactly 1 in the ncoalescent algorithm.

Code as submitted to Dryad

Version 0.2

let's call it a new version, with GNU licence headers