Fix some issues (aimclub#230)

Fix Problem with OptHistory aimclub#229
Fix Refactor utilities aimclub#173
Fix potential problem with n_jobs. It may appear if some multiprocessing modules cannot work with n_jobs < 0. Now n_jobs is checked and converted to positive value in GraphRequirements
Fix problem with retaining composing time calculation. Initial generation is taked as full generation, but it does not consume any time for preparing. Also fix problem with generation num increment.
Change version info from `0.3.3` to `0.4.0`.

Minor version upd

Upd version to 032

Update package version

Upd version to workaround pypi deleted version conflict

Simplify integration test to pass

requirements fix for PyPi release with setuptools (aimclub#35)

Fix requirements (2) and upd version for proper publish