This feature can help to reduce the data transferred about 60%, and the migration time can also be reduced about 70%.
Summary of changed from v3->v4
-Update the test data in the document
-Fix some typo errors
-Use compressBound instead of MACRO define
-Optimize the performance when compression co-work with XBZRLE
-Added some comments
-Rename some functions and variables
-Incorrect coding style fix
-QMP type change for compatibility
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1.9.1
