significant optimizations to Solver and CWalletTx::GetAmounts
a few more tweaks
alternate listaccounts / GetCredits functions
add caching to CWalletTx::GetAmounts and undo some other changes
Merge branch 'master-1.5' into optim2-1.5
Replaced references to litecoin with dogecoin.
Removed reference to Litecoin Wiki in releae process.
Corrected hostname for dogecoin.com (was dogecoin.org).
Merge pull request #273 from rnicoll/master-1.5

Replace references to litecoin with dogecoin.
Corrected reference to "Bitcoin" in French translation; now says "Dogecoin"
Version bump for 1.5.3
Adding new DNS seeds
Fixing comma in DNS seeds
Re-added shortcut key for sending Dogecoin from address tab, in French language
locale. Previous shortcut key ('c') clashed with an existing shortcut and
was unusable.
Merge pull request #279 from rnicoll/master-1.5

Remove reference to Bitcoin from French translation, correct shortcut key
fixed example address to match translation files
Merge pull request #281 from leofidus/master-1.5

Fixed example address to match translation files
Merge pull request #274 from somegeekintn/optim2-1.5

Wallet/RPC Optimizations