Many Small Improvements

- all balance calculations done through GetBalance() and GetMinted();
- RPC getinfo improvements (all[pow,pos]mint, new[pow,pos]mint);
- Qt client: overview page fixes for balance reporting.
Qt GUI: Many Improvements

- Stake miner controls;
- Wallet lock/unlock (also for staking only);
- Wallet keys export/import;
- Wallet inspect/repair;

Other minor enhancements.
Optional Rescan to importprivkey
FileCommit() Related Update
GetMyExternalIP() Improved
Better Logo Icons
MacOS X Related Fixes, Version and Checkpoints Updated
Qt GUI: A Small Typo
Orbitcoin Green Stake

A subsystem designed to improve staking performance and efficiency.

- Caching of block hashes, stake modifiers and stake inputs;
- User accessible split and combine controls for stake inputs
  (-stakesplit and -stakecombine);
- User changeable min. input amount for staking (-minstakinginput);
- Performance counters to monitor caching internals (RPC getcounters).

Other minor changes.
v1.5.0.0: Hard Fork to NeoScrypt

A hard fork at block #1010 changing the PoW hashing algorithm (Scrypt to
NeoScrypt) and block hashing algorithm (Scrypt to BLAKE2s). Intervals of
stake modifiers reduced (3 hours to 40 minutes) with a further intention
to decrease the minimal staking age (5 days to 1 day) on the 20-Dec-2014
12:00 GMT. Some minor corrections and improvements.
README Updated
Merge pull request #6 from ghostlander/master

v1.5.0.0