docs/devices: add Zone Touch Mouse T400

Thanks to Nestor from Logitech for providing me this device.

User experience note: the upper part (covering two-third) of the middle
button is the "METRO START SCREEN" button, the smaller bottom part
provides the "middle mouse button" (MIDLLE BUTTON). This might be OK
for a desktop user, but it's awful if you have a big hand like me and
make much use of it for opening URLs in a new tab or pasting stuff.

On the other hand, the middle button can be remapped and there is both
horizontal and vertical scrolling functionality.
docs/devices: add T650 touchpad

Thanks to Nestor from Logitech for providing me this device.

The firmware on this touchpad features out-of-the-box tap-to-click
(no host software needed). The following features work with no
additional software (tested in Linux 3.11-rc6 with KDE 4.11):

- Left-click: single tap
- Middle-click ("scroll-wheel click"): three finger tap
- Right-click ("context menu"): two finger tap or tap in right corner
- Navigate left ("Back"): three finger slide to left
- Navigate right ("Forward"): three finger swipe to the right
- Scroll (up/down/right/left): slide with two fingers
- Move pointer (any direction): slide

Click and drag is also possible (for example, for selecting text or
moving windows with Super + right/left-click in KDE), just press harder
on the surface. Right click is in the bottom-right corner, left is
anywhere else.

Sliding with three fingers up acts if you pressed Super. Sliding with
three fingers down triggers a key press of Super + D (normally the
"Show Desktop" in MSWIN).

Not working as it requires additional software:

- Pinch-to-zoom.
- Four-finger gestures, likely needs to be controlled via features as
  there are no HID messages at all.
docs/devices: add Anywhere MX mouse

Thanks to Nestor from Logitech for providing me this device.

This mouse has two buttons on the left, currently mapped to 8 (bottom
button) and 9 (top button).

Note: setting bit 1 of register 01 does odd things in KDE. I looked in
SetPoint 6.61.15 and could not find an option for "Side Scroll",
perhaps it is not applicable here?
docs/devicesmd: update with T400 and Anywhere MX
Merge pull request #117 from Lekensteyn/doc-updates

docs: added T400, T650, Anywhere MX dumps