Updates (V2 reward, OS X Mavericks compatibility, improved formatting)

 - Integrates V2 rewards structure from https://github.com/microcoinsource/microCoin_V2
 - Fixes for OS X Mavericks compiling (from Dogecoin and believed to be backwards compatible)
 - Improved MRC currency formatting
    - Supports system locale digit separation, e.g. 1,000,000.00 or 1.000.000,00)
    - Adds support for displaying MRC as kMRC (kilo-MRC) or megaMRC (mega chosen to not conflict with mMRC)