Fix changed button mapping, add more tablets

Newer kernels changed the way the phsyical button numbers er mapped to the X Server numbers
This patch fixes this by adding a mapping section to the wacom_devicelist now such changes can be addressed by
simply changing the config file.

This might mess up mapping for old kernels (before 2.6.38)
see http://ubuntuforums.org/showpost.php?p=9496609&postcount=1 section V for more information regarding this
and http://sourceforge.net/mailarchive/message.php?msg_id=27512095