Changes from Mercurial (hg https://foss.heptapod.net/isa-afp/afp-devel/ default)
Summary
- Added metadata for previous commit (Optics).
- Addition of theorems throughout, particularly for prisms. New "chantype" command allows the definition of an algebraic datatype with generated prisms. New "dataspace" command allows the definition of a local-based state space, including lenses and prisms. Addition of various examples.