all of the information we need is in one place, with proper links so we
don't have to do weird hacks to connect data together
we don't have to touch /proc/bus/usb/devices; doing so generates USB
messages to all devices, which can cause problems
works for all removable devices; usb-storage or ub should both work with
no changes, as long as mountpoints exist in /etc/fstab
doesn't need to fork lsusb
Old support is removed; unless serious, unfixable problems are found with
this method, the old code is too big and confusing to keep around. This
code needs more testing.