zCharDevice.py: change read/write block interface (incompatibility)

Signed-off-by: Federico Vaga <federico.vaga@gmail.com>
zCharDevice.py: fix chardevice handling bug

Signed-off-by: Federico Vaga <federico.vaga@gmail.com>
zInterface.py: change address to devname

Signed-off-by: Federico Vaga <federico.vaga@gmail.com>
interface: simplify code

Signed-off-by: Federico Vaga <federico.vaga@gmail.com>
PyZio: huge restyle [INCOMPATIBLE]

comment: more comments
style: apply python code style
code: review permission code, and device list

Signed-off-by: Federico Vaga <federico.vaga@gmail.com>