Test: Mixnet.  Alice has one pseudonym.  All recipients receive
    messages with equal probability and distribution.

  bgVolMean = 1/(1-pMsgAlice)

Variables: pathLen, pDelay, nRecipients, pMsgAlice

  N : 1024, 4096, 16384, 65536
  pL: 1, 4
  pD: .1, .6, .9
  pA: .1, .5, .9

  3*3*2*4 = 7200

Too big.  Start with:

  nym.1: pA==.1,.5, pD==.1,.6, pL=1, N=1024...65536
   [2*2*4 == 1600]

  nym.2: pA==.1,.5, pD==.9, pL=1, N=1024...65536
   [2*4] == 800

  nym.3: pA==.1, pD==.1,.6,.9, pL=4, N=1024...65536
   [3*4 == 1200]

  nym.4: pA==.5, pD==.1,.6,.9, pL=4, N=1024...65536
   [3*4 == 1200]