remeve dummy READMEs
rename `__cim_wget` to `cim_wget`
Collectly configure installed impls
fix sum bugs related to `cim use`
Do more thing on initialize
rename `__cim_split_impl_version` -> `cim_spslit_impl_version`
fix typo
* rename s/normarize_impl_version/cim_&/ s/set_sbcl_home_for/cim_&

* cim_split_impl_version sanitaize argument
more varidation