Display flip support

```
Enhancement to support 180 degrees display rotation. 

I have implemented it for myself and I can prepare package in case you are 
ready merge in HEAD. Not trivial because it must update WriteData() usage to 
follow HW cursor movement.
```

Original issue reported on code.google.com by `2p.plus....@gmail.com` on 14 Mar 2013 at 11:25
