Class MEGICodec

Codec --+
        |
       MEGICodec

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

  for each integer:
  d-leading zeros     = each zero means one add one to the bit width
  ?-bits for integer  = width of integer equal to sum of leading 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=MEGICodec()
>>> set(S.keys())==G.decode(G(S))
1

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