Now will remove extranous spaces from API key

First linting and reformating, to continue

Fixes for calibre 6, and some extra validation

on title handling

Pull all information in a Volume at once, to try to reduce the number…

… of API calls

Now returns volume description if issue description is empty. Reduced…

… default number of retrieved volumes to 2.

Now returns volume description if issue description is empty. Reduced…

… default number of retrieved volumes to 2.

Forgot checking if no author is passed to the plugin

Added zipped plugin to the repository

Adjusted widget width

Bump version to 0.11.2

Bump version to 0.11.1