Replace Integer with Item class
testElementS: check return value
testRemoveS: check return value
testAddF: fix typo in docstring
more timeout handling rework; remove most uses of MEDIUM_DELAY_MS; randomize timeouts and TimeUnits; write out IAE and ISE
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improve main methods; respect system properties; actually fail if a test fails
narrow scope of try-catch
narrow scope of try-catch
no wildcard imports
use serialClone in serialization tests; update imports
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Update Creative Commons license URL in legal notices
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improve exception handling
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Added tests
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