new Haskell envs, some for other languages

Migrate packages I had in separate user profiles into
myEnvFun environments.

I'm doing most Haskell dev with per-package shell.nix files, so these
Haskell environments are for new projects, where I want to hack before
setting up packaging, or just want to drop into a ghci and have packages
available.  As such, GHC versions besides 7.8.3 may be overkill.