Bring r17261 from trunk to 1.8 branch:
Refactoring dataset layout information to segregate the constant items
from the variable items (at least from a storage standpoint).
Tested on:
FreeBSD/32 6.3 (duty)
(h5committest performed on trunk)
Bring back revision 15131 from trunk:
Finish omnibus chunked dataset I/O refactoring, to separate general
actions on chunked datasets from actions that are specific to using the v1
B-tree index.
Cleaned up a few bugs and added some additional tests also.
Tested on:
Mac OS X/32 10.5.3 (amazon)
Linux/32 2.4 (chicago)
