Create a 2-bit to 8-bit utility per @telegraphic about blimpy HOT 6 OPEN

Hi Shami, thanks for the report, could I ask which version of blimpy are you using?

Danny Price (@telegraphic) since you implemented the 2-bit handling I'm assigning this to you :)

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Hey @shamichatterjee, does it work if you load the whole file? Can you point me toward a small 2-bit file with something interesting in it at a known location so I can work on it?

For 2-bit data you may be better off using sigpyproc (for now at least) - https://github.com/ewanbarr/sigpyproc

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@telegraphic sorry, I used a file from the Parkes HTRU archive and don't really have anything smaller, but Vishal G should be able to provide one. It sure looks like the 2-bit values are still packed and the combined value is interpreted as a (random) float when I try to access the array.

I installed the current version via downloading a zip file from GitHub - setup.py lists
version = '1.3.4'

I did try sigpyproc just now - it installed fine but trying to import led to a syntax error on a fairly innocuous line: raise ValueError,"readsamps must be > skipback value")
I'll try to look into that but I suspect that's maybe a mess.

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Labelling both a bug and an enhancement!

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This relates to #25, which I will close as a duplicate issue

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After some discussion, we think that a better approach is to create a 2-bit to 8-bit utility, and will only support uint8 and above.

A error should be raised if data are 2-bit, with direction in the docstring to the 2to8 utility.

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