ISPN-4648 Log rebalancing messages to specific category
ISPN-4109 Document API changes for Infinispan 7 Upgrade guide

* Added upgrade to 7.0 from 6.0 section
* Detail loader/writer changes and package refactoring for filters
ISPN-4654 AND over range queries does not work (indexless query)

Some subscription gets mistakenly suspended.
ISPN-4470 Remove tabs and fix other formatting issues
ISPN-4470 RemoteCache's size() method should compute size globally

* A new statistic added that shows the number of keys a cache is
primary owner for. Use that statistic, calculated cluster wide,
to count the total number of entries in the cluster for the
remote cache.
* If statistics disabled, or using Hot Rod 1.x protocol,
keySet().size() is used as fallback.