o drop support for node names in name stack, support only symlinks

With well defined and kernel-supplied node names, we no longer need

to support a possible stack of conflicting symlinks and node names.

From there on, only symlinks with identical names can be claimed

by multiple devices. It will simplify the logic a lot and shrink

/dev/.udev/names/ significantly. Also exclude "*/MAJ:MIN" link names

from the name stack, they can not conflict.

o remove most NAME= rules (they are provided by the 2.6.31 kernel)

o convert firmware.sh to C

o "udevadm control" commands will only accept the --<command> syntax

o get rid of braindead "scan all devices to find myself" libusb interface

if it can not be fixed, drop libusb entirely

o remove copy of bsg.h

o drop all support for the DEPRECATED sysfs layout

o add warning for BUS, SYSFS, ID