v2.0.0: Merge pull request #2 from mjrodgers/develop

The main new features for this version are the following:

• SubsetProcess has new signatures allowing iteration over subsets of a fixed size.
• there is a new SubspaceProcess intrinsic allowing iteration over subspaces of a (finite) vector space of fixed dimension.

There are also some bugfixes:

• A typo in the signature of the CanonicalVertexSet intrinsic was corrected

v1.0.0

Initial release