[svn-r15765] This is the second checkin for the filter of modifying dataset's datatype. There're a lot

of changes since the last checkin.  Basically, I put a skipped list in the filter to keep
track of the old (current) datatype for the chunk when the data chunk is read into the 
memory.  When the datatype is changed, the filter will decrement the reference count for
the old datatype.  Another significant change is putting a B-tree in the filter to record 
the reference count of some datatype from the data chunks.  When the dataset is deleted, 
the filter will decrement this many reference count for the datatype all at once to save 
time.

This project is wrapped up at this point temporarily because of the flaws in the design.
Quincey will talk to the people in Chicago about redesigning it.

I've tested it on smirom, kagiso, and linew.

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