Class MEGRCodec

Codec --+
        |
       MEGRCodec

MEG vector encoding zero runs.

FORMAT:
  C_Alpha code        = len(Ns)
  1-bit flag          = counts? (T/F)=(1/0)
  C_Alpha code        = sum(counts) (optional)

  for each integer:
  0unary encoded scal increase  = each zero means one add one to the bit width
  ?-bits for integer            = width of integer equal to sum of unary zeros seen so far + 1
  C_Alpha code                   = counts(optiona)

>>> S=RandomDict(200,N=600)
>>> Ss=[RandomDict(200,N=600) for x in xrange(100)]

>>> G=MEGRCodec()
>>> set(S.keys())==G.decode(G(S))
1

>>> G=MEGRCodec(counts=True)
>>> G.decode(G(S))==S
1