MF ISBN:

Merged /projects/print2013/en_US.ISO8859-1:r40693-40726
Merged /projects/ISBN_1-57176-407-0/en_US.ISO8859-1:r40727-41455,

41457-41469,41472-41477,41479-41513,41515-41521,41523-41577,
41579-41581,41583-42013

Notes: This merge entirely excludes the en_US/books/handbook/ppp-and-slip/
changes. They will need to be looked at a bit more closely.

Note to translators: I am very, very sorry. There was no *clean* way
to merge this as separate commits. Trust me, I tried.
The revision logs for the ISBN branch should provide some insight to what
content has changed. I am more than happy to help out here. Sorry :(

Approved by: doceng (implicit)