Nikita Timofeev created CAY-2228:
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             Summary: Deprecate multiple cache groups in caching and query API
                 Key: CAY-2228
                 URL: https://issues.apache.org/jira/browse/CAY-2228
             Project: Cayenne
          Issue Type: Improvement
          Components: Core Library
            Reporter: Nikita Timofeev
            Assignee: Nikita Timofeev
             Fix For: 4.0.M5


We should drop support for multiple cache groups as it have little practical 
sense.
Only available caching provider with proper support for it is OS Cache and it 
is obsolete and should be actually deprecated too. 

So here is required API changes:
- replace internally multiple cache groups with single group
- deprecate corresponding 3.1 API and warn when multiple cache groups provided
- remove corresponding 4.0 API completely (e.g. in fluent queries API)



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