HCOLL 5 Working and 99% complete entrySet(), keySet() and values()

Working and 99% complete entrySet(), keySet() and values() methods for HugeHashMap.
I'm missing some functionality for values() (remove to be reflected in the map), but the rest should be there.
Pls. take a look, let me know if it's ok if I go the same way for SHM too, or you would prefer some other approach.

Also found a bug, where size was not properly reset on map.clear().

Also managed to BREAK HugeHashMapTest.testPutPerf(), I don't yet know why... Pls. comment if it's obvious to you, otherwise I'll investigate further. Btw. how do you normally run all the unit tests? From IntelliJ?