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This also fixes a potential problem with layered SBMs, where the move
probabilities would be incorrectly computed.

This changes the underlying adjacency matrix implementation to a single
mixed in + out edge list for each node, instead of separate ones. This
simplifies the undirected_adaptor<> so that its out-edge iterators
become trivial, and also faster.

This reverts commit df948de9.

As it turns out, some slightly older compilers (e.g. GCC 5.6) do not
like this.

This fixes issue #351

This fixes a bug with isolated nodes that contain only self-loops.

This solves a problem when NestedBlockState.mcmc_sweep() is invoked with
nonstandard values of the parameter 'c'.

This adds support for exact likelihood calculation, correct posterior
sampling of models with nonempty groups, much improved "distributed"
degree-corrected prior, as well as continuous edge covariates.