- all back-ends: fail on non-zero domain

- review class names

Setpci:
- auto-width
- extend the register table

Capabilities with partial decoding:
- PCIe 2nd set of control/status registers (have spec)
- HyperTransport caps (have spec)

Capabilities with no decoding:
- CompactPCI hot-swap
- CompactPCI central resource control
- AGP3
- Secure device
- Power Budgeting (ext'd, needs write access to enumerate)
- Root Complex * (ext'd)
- Multi-Function Virtual Channel (ext'd)
- Root Bridge Control Block (ext'd)

PCIIDS:
- delete old DB at SF