HPPC-150: Make the default key mixing strategy globally configurable (via "hppc.bitmixer" sysprop). This property allows switching from random bit mixer strategy to any of the following: - random the default strategy. Varies bit mixer per instance. - deterministic the default strategy in HPPC up to v. 0.6.x. Varies bit mixer depending on hash container size. - none No bit mixing is used (hash sets/maps become scatter sets/ maps).
This is a last-resort, discouraged, property. Your code should not
rely on hash map/set ordering. Your code should use scatter maps when
speed is of absolute importance and there are guarantees that keys
won't be copied around to other associative containers.
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