Slepian–Wolf full rate region — error event decomposition #

Publishes the joint typicality decoder and the 4-way error event decomposition E ⊆ E_0 ∪ E_X ∪ E_Y ∪ E_{XY}, the encoder-side mirror of ChannelCodingAchievability.errorProbAt_le_E1_plus_E2.