changes in structures 1.6-1.7

["Yury Tarasievich" <yury.tarasievich@xxxxxxxxx>]

Hi,

Are there any brief summaries, suitable for those not-so-experienced,
on what got changed in drivers's upporting structures when evolving
from 1.6 to 1.7?

The module code, which is compilable on 1.6-RELEASE, won't compile on
1.7-CURRENT.