- Added rho/sigma/constants fields to the runs, on which the new code is
based. Over time, .locals should be deprecated in favour of these
better variants.
- Untyped variant is out of grace for the time being (cf. Athena interm
problems)
- Improved graph output further.
Minor:
- Added TERMLISTADD and APPEND macros for more concise code.
- Added TERMLISTERROR constant, and corresponding tests.
Note that this will not work in many contexts, because only NULL is
usually considered to be a special value. It is purely intended for
the new type evaluation functions in type.c.
