[Mark Friedenbach]
    * Add the new difficulty adjustment algorithm, which replaces the simple
      average over 2016 blocks with a faster-acting 144-tap Parks and
      McClellan FIR filter, and adjustments every 9 blocks with a gain of
      0.1025 and limiter of 1.055.
    * Prepare for deployment of difficulty adjustment filter to production
      network by adding a threshold block after which the new difficulty
      adjustment algorithm takes over, for both mainnet and testnet.
    * Added Python simulator of new difficulty adjustment algorithm.
    * Fixed two related bugs in the freicoin "accounts" system. First, the
      'move' RPC command now generates AccountingEntry records with the
      current reference height rather than refheight=0. Second, the
      'listaccounts' RPC command properly time-value adjusts AccountingEntry
      records.
    * Fix unwanted transaction de-prioritization. Now calculates both inputs
      and outputs of a transaction based on the transaction's reference
      height, as opposed to the current block height, which was previously
      being used for the inputs. This was resulting in smaller (or even
      negative) fees for the purposes of priority calculation, thereby
      resulting in transactions that had trouble getting on the block chain.
    * Change nVersion on Freicoin Foundation addresses to testnet format, so
      that budgets validate correctly. This enables mining on testnet.
    * Modified output of 'getblocktemplate' RPC command to include a 'budget'
      array specifying budgetary requirements.

  [Clark Minor]
    * Fix forking bug due to truncation of initial distribution calculation.