Sync the Norwegian and English book, r2056:2073.
* src/nb/LAST_UPDATED Updated by make sync.
* src/nb/book/ch07.xml Merged r2066, r2070, r2072.
* src/nb/TRANSLATION-STATUS ch07.xml decreased to 26%.
Authored by: sunny256 2006-03-15
Parent: [r2073]
Child: [r2075]
