with fixed sized chunk heaps, grow a new heap for the chunk size when applicable
with fixed sized chunk heaps, grow a new heap for the chunk size when applicable

norton/chibi-scheme,norton/chibi-scheme,holmescn/chibi-scheme,holmescn/chibi-scheme,norton/chibi-scheme,holmescn/chibi-scheme,holmescn/chibi-scheme,holmescn/chibi-scheme,norton/chibi-scheme,norton/chibi-scheme,norton/chibi-scheme