Issues 21 + 22 fix (#24)

* import GENE2POS directly from data.py, allows for easy exploratorive work in notebooks

* import GENE2POS correctly

* fixes #22, computing point mutations resultant from out-of-frame deletions

* fix indent in line 415

* add docstring to identifying out-of-frame substitutions

* fixes #21

* lab notebook for solving issues 22 and 21, regarding point mutations resultant from out-of-frame deletions

* update deletion naming convention based on corrected numbering system

* add comments

* more docstrings

* import submodules so they can be used in notebooks

* clean up and update