CWallet constructor (and some of the CWallet's static methods) now take chainParams as parameter. This enabled us to get fix many calls to DecodeAddress, that did not specify chainParams as an explicit parameter.
Wallet_tests. Cpp: wallet was moved from static to local function scope, so that it can be initialized after chainParameters are available. I've preserved the global locking mechanism by adding walletCriticalSection (some state like vCoins is still global)