Eng 6095 index with address

Don't merge, only for review.

Pass eecheck on local machine, but haven't check the result of Junit test.

I worry about how to deconstruct Key and Data: is the default deconstructor enough?

After refining the code, the next step is to append address to KeyType other than IntsKey.
MAXPOINTER is not used locally -- it seems to already be defined where it is needed, so remove it here.