unification of coding style

General rules we adhere:

• names: snake_case, class names: CamelCase
• all names: it should make sense,
• length of names: what is detail that can be left away, make it as succinct as possible (for instance, envs.generators.rail_from_manual_specifications_generator is too long)
• comment: if the idead cannot be read from the structure of the code, then write a comment.

See https://realpython.com/python-pep8/

Procedure

• Everyone goes through their code, re-read it and try to understand (good luck)... improve rea
• Read other people's code and give feedback, you may add items to the following list.

Issues List

• @mohanty shorten envs.generators.rail_from_manual_specifications_generator