add more cell strategies
uncomment some working strings in struct-test
uncomment old procedure with keyword args test for structs (it works now)
Merge branch 'master' of https://github.com/samth/pycket
Merge branch 'master' of https://github.com/samth/pycket
wrap mutable struct values (into W_Cell) in constructor
wrap mutable struct values (into W_Cell) in constructor (fix)