TNT proposal with degree bounds

Description

Implements a TNT proposal with any subset of the following features:

1. upper on degree, specified via the bd constraint's maxout, maxin, and attribs arguments

2. stratification of proposals according to mixing type on a vertex attribute, specified via the strat hint;

3. fixation of specified mixing types on a(nother) vertex attribute, specified via the blocks constraint.

Details

This proposal is not referenced in the lookup table.