Logistic regression: New API

* Changed the API of logistic regression to add place holder for
  grouping support.

* Also updated user doc and install-check.

* Also wrote new input/output tests for the new API of logistic
  regression.

Other minor changes:

* Also removed the execution mode of some files

* Changed compatibility module's install-check to make it utilize linear
  regression instead of the old API of logistic regression.

* In the Python AL, the iteration controller, added function to handle
  convergence without grouping

* General CV module does not need its own wrapper for the older logistic
  regression any more