Issue#430/rename all files pep8 compliance

This MR get some of changes I have done for issue #430 (closed) concerning pep8/pylint compliance about modules name.

It also includes:

• mypy_act2 from @inglada
• issue #245 (closed) about os.system
• correct three tests about previous refactoring
• correct Parameters field in docstring (: or missing s)
• add .pylintrc in iota2/iota2 to be used without specify the one in utilities
• isort was passed over all source files (part of #464 (closed) )
• merge contributing branch
• merge !52 (closed)
• remove Publishing folder
• introduce entry_points for executables

The .pylintrc file was generated with new pylint version, which is compatible with the current version.

Some error codes had been added to ignore certain messages, I will list them in issue #456 (closed) to take them into account later.