Massive update:

  - Added new protocol for binart string pickles that
    takes out unneeded puts.

  - Change unpickler to use internal data structure instead
    of list to reduce unpickling times by about a third.

  - Many cleanups to get rid of obfuscated error handling
    involving 'goto finally' and status vars.

  - Extensive reGuidofication.

  - Fixed binary floating-point pickling bug.