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Add instructions for local MR-jar testing
Verified that the C/I tests actually do make use of the `sun.nio.ch` package for memory-mapped files. Removing the runtime JPMS flag for this package from Surefire results in a warning, since the tests use the classpath and not the module path. Using the module path in the tests would require a local `module-info.java` in the tests, which would present problems for Java8. Using Datasketches Memory for memory-mapped in a JPMS-enabled user application requires explicit opens access to the `sun.nio.ch` package otherwise the user application will exit with a hard failure instead of a warning.
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