Licensing text in source files

[perib]

TPOT1 had some files with licensing text from other packages (for example: https://github.com/EpistasisLab/tpot/blob/master/tpot/builtins/one_hot_encoder.py)

Do we add those here as well?

Additionally, TPOT1 started its source files with the following text. Do we do the same in TPOT2?

-- coding: utf-8 --

"""This file is part of the TPOT library.

TPOT was primarily developed at the University of Pennsylvania by:
- Randal S. Olson (rso@randalolson.com)
- Weixuan Fu (weixuanf@upenn.edu)
- Daniel Angell (dpa34@drexel.edu)
- and many more generous open source contributors

TPOT is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3 of
the License, or (at your option) any later version.

TPOT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with TPOT. If not, see http://www.gnu.org/licenses/.

"""