FT232h changes


Emmanuel,

Here's the changes to support the FT232H chip - tested using a UM232H module. I don't have FT2232H or FT4232H hardware to test those, so you should test with that to make sure I didn't break anything.

I had to change the way the type of chip is selected - adding two other fields to the dictionary, in a 3-tuple - to be able to distinguish all the chips correctly.

I also updated the Troubleshooting section fo the README.rst. file.

Will you let me know if there are any problems with this pull request?

cheers
adam
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Adam Feuer