Load proving/verifying keys at startup from the public alpha parameters file.

src/util.h

@@ -104,6 +104,8 @@ static inline bool error(const char* format)
     return false;
 }
 
+const boost::filesystem::path &ZC_GetParamsDir();
+
 void PrintExceptionContinue(const std::exception *pex, const char* pszThread);
 void ParseParameters(int argc, const char*const argv[]);
 void FileCommit(FILE *fileout);