Provide an easier/safer way to manage hsRefCnt subclasses
Replace most vault *IncRef() API functions with hsRef versions
Also use hsRef for the vault functions which "return" lists
Use hsRef for storage of the remaining vault nodes
Add a RefCnt leak debug tracker
Fix leak check race condition, and remove an unintentional circular ref
Unify leak checkers
Make hsRefCnt atomic, and merge with hsAtomicRefCnt
Merge pull request #437 from zrax/hsRef

Clean up ref-counting