Rename RWTable "address" column

[ChihChengLiang]

• col. 4 Address is the position to Stack, Memory, or account, where the read or write takes place, depending on the cell value of the Tag column.

The "Address" column is used for multi-purposes. It is used for the stack pointer (10 bits), memory addresses(32 bits), and account address (160bits). When we call the column "Address", people would think it refers to only account addresses.

We propose to rename it to "location" to prevent confusion.