duplicate functionality?

[jaycedowell]

@telegraphic has noted that both bifrost.block and bifrost.pipeline provide the same functionality. There are also several other places in Bifrost where this seems to happen:

• DataType.py vs. dtype.py
• ring.py vs. ring2.py
• block.py vs. pipeline.py
  We should look through these pairs to (1) see if they are indeed duplicating functionality and (2) if so, which one gets eliminated. @telegraphic has already voted to remove block.py.

[jaycedowell]

For a FYI on ring.py vs. ring2.py: ring.py is currently in use for the tutorials. I also use it extensively in my code that uses the lower level Python API.