Margo: Swap rule is missing.

[raman22feb1988]

In Margo and variants, if White player plays within too strong an opening move, then in all serious implementations of Shibumi and variants, Black player should be given within an option to swap the colours of the played game without making any move, as if Black player had played with in that first move whatever White player had played within.

This swap rule is missing in Jocly implementation of Margo and variants and I suggest to add it.
Please read http://www.cameronius.com/games/margo/margo-basics-41.pdf for more information about it.