markov: new module
markov: new module

Former-commit-id: 21d55a1b9b52b14451d6e626a6a6210c9eb3fc30 [formerly 41cc9991c29ba73bb4c45b7d0539816acc0fe2e3]
Former-commit-id: 517662d89c22137ed1840679612e137cfb91f194
torhve/ivar2,torhve/ivar2,haste/ivar2,torhve/ivar2