Tested with both Peruse 1.2 and master, with and without baloo enabled.

For test files, I used:
- a CBZ created by hand, with a hand-written ACBF file;
- a CBZ created using perusecreator;
- and the two volumes of Pepper & Carrot that the Peruse commit log says were used as test cases for ACBF support.

In both versions, ACBF metadata does not appear to be used at all. I can see, in the terminal, a huge number of logging messages from AdvancedComicBookFormat, e.g.

```
bool AdvancedComicBookFormat::Sequence::fromXml(QXmlStreamReader*) Created sequence entry, which places this book as number 2 in the series "Pepper & Carrot"
bool AdvancedComicBookFormat::Author::fromXml(QXmlStreamReader*) Created author "David" "Revoy" "" responsible for "Writer" for language ""
bool AdvancedComicBookFormat::BookInfo::fromXml(QXmlStreamReader*) Created book information for the book with the titles ("Pepper & Carrot - Vol. 2", "Pepper & Carrot - Tome 2", "Pepper & Carrot - Zväzok č. 2")
```

but this isn't reflected in the UI; "group by author" does nothing, "group by series" groups by the directory the CBZ files are in, and "group by title" groups by the file name, the same as for non-ACBF books.

It is especially disheartening that Peruse can't even read ACBF files that it itself generates.

Peruse master, additionally, sometimes crashes when attempting to display the info panel for ACBF books. When it doesn't crash, it shows as up "publisher unknown, author unknown, no description", same as 1.2 and same as non-ACBF books.