Add setup.py for easy installation

[jr-42]

Added a setup.py and requirements in order to be able to install locally.
Included changes to ficus code from PR #3

[ntropy-esa]

Should there be a version requirement on pyomo?

Three years ago, I used to work with pyomo 5.6.1 which no longer works unless we explicitly revert also to PyUtilib=5.6.5
"ImportError: pyutilib.enum has been removed.
Python 3 now has an enum implementation in the standard library (also
available for older Python versions as the third-party enum34 PyPI
package) that supersedes this library."

Working with a newer version of pyomo=5.7.3, there would be bugs in writing the report files in Excel (functions report(prob, result_dir) & get_entities & _get_onset_names ), because of pyomo related changes (some domain name are 'Any' instead of 'None', which bugged an if statement in ficus's code).

And I also got issues related to xlrd and openpyxel (empty dataframes not handled in the same way).

Lasty, changes in pandas: as_matrix can be replaced by to_numpy

[jr-42]

I came across this Pyomo error with the 'Any's and the 'None'. I did a little workaround in the if loop but I will test if changing the version of pyomo works.

Will change as_matrix to to_numpy.