[libgweather] (14 commits) ...ci: Lint Python script in the CI

[Bastien Nocera <hadess src gnome org>]

Summary of changes:

  21181fa... location: Fix indentation of comment (*)
  996dbb5... gweather: Add auto pointer types for location and timezone (*)
  5de6612... gweather: Change API to return references (*)
  0fd9d41... ci: Add python3-gobject for database generation (*)
  3baa1fb... gweather: Add new GVariant schema and database generator (*)
  5bdaac8... gweather: Add generated GVariant access file for database (*)
  f4f8bd4... gweather: Port to new GVariant based in-memory DB (*)
  d8ddaf8... test: Add tree walk test (*)
  ec0a2d5... location-entry: Port location entry to new iteration API (*)
  a446007... location-entry: Use a list store instead of a tree store (*)
  a221531... location-entry: Sort locations in drop-down (*)
  85d3be3... location: Clarify purpose of year start/end information (*)
  6f444b3... data: Run pylint test over variant DB generator (*)
  b27e7a8... ci: Lint Python script in the CI (*)

(*) This commit already existed in another branch; no separate mail sent