Elias with more concurrency changes -- again

Hello again! Thanks for moving my "concurrent" branch over to the trunk. I've been working on adding more unit tests, these are attached to bug 24159. I haven't measured code coverage, but coverage should be pretty decent. I also worked on a RollingFileAppender implementation. To get this to wor

DO NOT REPLY [Bug 24159] - Log4J can create deadlock conditions (concurrent package donation)

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DO NOT REPLY [Bug 40755] New: - Update source header per ASF Header policy

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