Hello!

One is that using -P and -s together doesn't work because we haven't
scanned the entire topology.

$ ./lspci-mw -PF tests/fujitsu-p8010.lspci -s 1d:00.0
00:1e.0/03.0/00.0 Network controller: 3Com Corporation 3com 3CRWE154G72 [Office Connect Wireless LAN Adapter] (rev 01)
$ ./lspci-mm -PF tests/fujitsu-p8010.lspci -s 1d:00.0
1d:00.0 Network controller: 3Com Corporation 3com 3CRWE154G72 [Office Connect Wireless LAN Adapter] (rev 01)

Fixed. When topology is required, we now scan all devices and apply the
filters later.

The other is that even when not using -s, the topology isn't fully represented:

$ ./lspci-mm -PF tests/fujitsu-p8010.lspci |grep 3com
00:1e.0/00.0 Network controller: 3Com Corporation 3com 3CRWE154G72 [Office Connect Wireless LAN Adapter] (rev 01)

Ah well, it seems that the tree mode never worked with CardBus bridges. Fixed.

After some pondering, I changed the format of the paths to include bus numbers
in all steps. I think it is more intuitive.

Please give it a try. If it works, I will merge the branch to master.

					Martin