Add VariableWidthRandomAccessBlockCursor
Remove VariableWidthBlock and VariableWidthBlockCursor
Remove unused PoissonizedBlock
Change SnappyBlock to be random access
Merge RandomAccessBlock and Block
Merge RandomAccessPage and Page
Rename VariableWidthRandomAccessBlock to VariableWidthBlock
Add option to display results diff to verifier
Add regex to skip correctness check for certain queries