Revamp the `PostsStatsHelper::fetchAll` function to allow using it like the official `dcBlog::getPosts` method.
Add functions returning SQL expressions to retrieve the number of shares and the popularity of a post.
Add a function to retrieve the SQL fields related to the number of shares.
Beautify the definition of the SQL columns.
Get the `fetchAll` function to do all the job within a single SQL query.
Add a field to the SQL request returning a popularity ranking.
Roll the v0.9.0.