No more 'from glpk.glpkpi import *'
No more info logging
pycharm eliminated an import of 'types'
Missing variables are determined much more efficient now when a new objective is set.
Revert "Missing variables are determined much more efficient now when a new objective is set."

This reverts commit 75b2eb112ddb2d5d2ae15a5c8d9aa6ea40467a6a.
Missing variables are determined much more efficient now when a new objective is set.