Remove locks from KeyBundle

[jschlyter]

In production systems it turns out readerwriter locks sometimes ends up trying to release locks multiple times. It would help a lot if we could make KeyBundle thread safe without the use of locks.

[rohe]

Agree! I don't have any proposal right now. If I come up with something I'll let you know.

[jschlyter]

Reading the code for KeyBundle there seems to be some wrong assumptions, e.g. that arrays are copied by value and not reference.

[rohe]

Agree, should be fixed. You or me ?

[jschlyter]

I've started in #110. To remove the locks, we could begin with the read locks.