Write the total pages count to the filesystem on book load
Write the total pages count to the filesystem on book load

It would be kind of nice to have this already there, but this is
safe and more accurate than any just-data heuristic could sensibly
be (e.g. number of entries in a zip file isn't the same as the
page count of a cbz file, which commonly will also include at least
one directory entry and a Thumbs.db)

KDE/peruse,KDE/peruse,KDE/peruse