puffs port - status 1

[Tatsiana Severyna]

Hi,

I'm working on porting puffs from NetBSD.

Achievements so far:
- putter kernel driver looks complete
- puffs kernel level part port is in progress (it compiles, but some
important code paths are commented out)
- libpuffs port was not really hard, but there are still differences
between NetBSD and FreeBSD VFS implementations to be cleared out

Plan for next week is to get pnullfs (nullfs implementation for puffs)
mounting and partially working.