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Thanks to Hank Grabowski.

Fixes issue #366.

Previously EventHandler.init() was not called. Now it is called by
AbstractDetector.init() and similarly for Fields. Added a test case.

Fixes #471

Allow an OrekitException to be thrown from EventHandler.init() like the other
methods.

Fixes issue #352.

Fixes issue #398.

Fixes issue #411.

Fixes issue #462.