Update of model_1_missing with more compact 2.1 imputation syntax (again).
Update of model_1_missing with more compact 2.1 imputation syntax (again).

git-svn-id: 1df7fcefc24ce524793a7474bd98e66739d04a42@1163 15d7aa0b-6f1a-0410-991a-d59f85d14984

matthew-brett/pymc,matthew-brett/pymc