[Merge] lp:~artmello/webbrowser-app/webbrowser-app-bookmark_folders into lp:webbrowser-app

[Arthur Mello]

> The SQL "bookmarks" table should probably have a foreign key constraint on
> folderId. See https://www.sqlite.org/foreignkeys.html.

It seems that Foreign Key support is disabled by default and need to be enabled setting the PRAGMA foreign_keys. But it is not possible to enable it in a multi-statement transaction so we would need to set it before each relevant transaction in the bookmarks-model. I think that could be error prone but can be done for sure. What do you think? Or maybe there is another way to do it that I am missing.
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https://code.launchpad.net/~artmello/webbrowser-app/webbrowser-app-bookmark_folders/+merge/260410
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