Added gradual unit typing for functions, work in progress
Fixed commit
in progress of adding join_op etc, stuck in middle of proof for join_opp is a function
Added join functions for gradual annotations, proofen them to be functions
Completely moved from Q to variable base-type.
cleanup
added proposition for values, added substitution function
Added proposition for values, added join functions for value annotations,
added substitution function.
flattened terms, adapted value-property and substitution function
Added guards and casts
added smallstep-semantics
Added cast to smallstep-semantic, smallstep-semantic is complete.
stuck in proof for "values don't reduce"-lemma
Added typing, cast still todo
typing complete
In proof for progress.
proof of process lemma
Problem in progress-lemma with case-statement
minor corrections, comments
added missing cases to stuckterm, completed proof for progress