Made stat block and superblock 512 bytes.
Merge branch 'next' into daniel_small_metablocks
Placed the CT_ASSERTs in a separate function
Fixed the superblock size so it actually fits into a 512 serializer block.
Removed superfluous backslash
Merge branch 'daniel_small_metablocks' into next

Conflicts:
	src/btree/get_distribution.cc
	src/btree/operations.cc