RRD4J 3.6

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Fabrice Bacchella

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Apr 6, 2020, 6:02:10 PM4/6/20
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Adding source for background or overlay image. They can be now an URL or even a custom generated image.

An image can also be added in the canvas (the area where the plot are drawn).

Dropped java 1.7 support.

Build settings to compile with latest JVM, but still able to run on the officially support JVM.

A new pool, using features from Java 8. They were some rare leaks in the old one and using modern java features should reduce locking.
It contains some assert so it might help discover problems early. All the public Pool.requestRrdDb are not deprecated any more, as they provide
a convenient way to get RrdDb using a pool.

* Fixed Issue 135: ByteBufferBackend.get fails with BufferUnderflow.

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