change method name in CommandContainer, update() -> updateOrInsert(), to more accurately reflect it's purpose.

Fix bug in changing encrypted DB password that kept the file handle open when the wrong password was supplied. (test case from Jens Hohmuth).

MVStore: an IndexOutOfBoundsException could sometimes occur MVMap.openVersion when concurrently accessing the store. 

and which servers that are available. (patch from  Nikolaj Fogh) 

Issue 565: MVStore: concurrently adding LOB objects (with MULTI_THREADED option) resulted in a NullPointerException. 

There was a way to prevent a database from being re-opened, by creating a column constraint that references a table with a higher id.