add syslinux.cfg for my portable computer

Signed-off-by: Mattias Andrée <maandree@operamail.com>
add xmodmap for portable computer

Signed-off-by: Mattias Andrée <maandree@operamail.com>
add ~/.x* for the portable computer

Signed-off-by: Mattias Andrée <maandree@operamail.com>