back out caching changes in CWalletTx::GetAmounts
Merge pull request #342 from somegeekintn/master-1.6

Back out caching changes in CWalletTx::GetAmounts (fix #341)
Update to reflect static block rewards change
Merge pull request #344 from djbender/patch-1

Update to reflect static block rewards change
Clarified label on constant containing difficulty change interval.
Merge branch 'master-1.6' of https://github.com/rnicoll/dogecoin into master-1.6