bitcoin: add support for altcoins, add litecoin and namecoin
Got namecoin to compile.
Added peercoin, a proof-of-stake-based cyrptocurrency.
Re-organized the cryptocurrency code.

Each cryptocurrency in a separate file, and less duplication of code
between the headless and gui expressions.
Add suffix d to headless altcoin daemons.
Add Haskell package 'gtk-traymanager'
Add haskell package 'taffybar'