[feature-update] Created a response class for all modules

[ayushanand18]

Overview

This is a long PR (very long, I believe) and I am really sorry for that.

This PR aims to add response class OBISQueryResult to every module.

Changes introduced

A response class in each module has

• an __init__ function (to initialize but no specialized function to do
• all existing functions as methods to the class
• get_search_url returns OBIS API URL for the query
• some functions have get_mapper_url methods to get OBIS Mapper URL, we identify functions to show a mapper url using a self.mapper flag (if true for a method then it has a corresponding Mapper URL).
• docstrings have also been updated

Additional Changes

• Tests have also been updated so this PR has become huge. But each of them are passing and new tests for new methods and an extensive testing to check whether returned url do really exist have been introduced. I believe this will make this package more robust.
• Docs for occurrences module have also been changed just to make it easy for figuring out how things would look after this update. But not for other modules. I am working on another PR after this to work on updating all the docs. I stopped from doing all that in this PR to curtail PR length which is already very huge.

Thanks!

[ayushanand18]

Once again, I am sorry for this huge PR.

[ayushanand18]

I don't like the reuse of the name OBISQueryResult for all of these classes.

I also see you have duplicate code for get_search_url in several of these classes. You can define the methods once in a parent class or you can define the functions in a common module and attach them, either will remove the duplication.

Thank you for the review!

• I will rename the classes in each module something more tailored say NodesQuery for nodes module and similarly.
• I will add a superclass OBISQueryResult in obisutils that is inherited by classes in each module.

Update: I have made those changes and updated the docstrings.

[7yl4r]

relevant discussions regarding this reorganization are on #69 and #70