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
Merge pull request #273 from rnicoll/master-1.5

Replace references to litecoin with dogecoin.
Version bump for 1.5.3
Adding new DNS seeds
Fixing comma in DNS seeds
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
Update init.cpp

Removed semicolon at the end of the -wallet argument in the help message which was preventing everything below it from showing up.
Merge pull request #303 from asadhaider/master-1.5

Update init.cpp