Small spacing fixes like imports in separate lines
for more clarity, and the position of the license.
Added many docstrings to clarify the methods, and spaces
after commas in order to comply with Python PEP8 style.
Also break many lines so that they are shorter than 80 characters.
Also import `todo` and `translate` from the utils module
instead of from `DraftGui`.
Otherwise we have to import the entire `DraftGui` module
which creates dependency problems when we want to use
some functions without the graphical interface.
