Hi,
I added the following changes in order to get the touchscreen on my
thinkpad x200t to work.

Quick summary:

- Add functions to locate modules for linux-libre.
- Change linux-libre to not include non deterministic symlinks to dead
  items and package the source in separate output.
- Add input-wacom driver and inputattach.
- Add an inputattach service type that starts inputattach as a daemon.
- Document the new service type

There are some things worth discussing about these patches:

- firmware.scm for input-wacom is probably not quite the optimal file.
- linux-libre gains quite some size from packaging its build tree
- Lots of small things
- Maybe other things

It would be nice if someone could review the patches.

Tim.