====== Png ======

  * update stpr262
  * can wrap sstSocketStream
  * what to do about inflater dictionary?
  * get 32x32 pcx, gif etc.
  * need test for deflater>>reset
  * need strategy test
  * fix InflateReadStream>>initialize. do an ensureCapacity instead of making buffer twice the input size. Look for other copyAndGrowBy:
  * run code coverage
  * document stream overrides
  * check out of scope references