Introduced LogUtil file + Logger class

- The new LogUtil.cpp / LogUtil.hpp files contain the enum definitions
  for MessageType and formatting functions.

- The Logger class is meant to be the instance which is held by the
  static OpmLog singleton class.

opm/parser/eclipse/OpmLog/OpmLog.cpp

@@ -20,57 +20,26 @@
 #include <stdexcept>
 
 #include <opm/parser/eclipse/OpmLog/OpmLog.hpp>
+#include <opm/parser/eclipse/OpmLog/Logger.hpp>
 
 namespace Opm {
 
 
+    std::shared_ptr<Logger> OpmLog::getLogger() {
+        if (!m_logger)
+            m_logger.reset( new Logger() );
 
-    std::string OpmLog::fileMessage(const std::string& filename , size_t line , const std::string& message) {
-        std::ostringstream oss;
-
-        oss << filename << ":" << line << ": " << message;
-
-        return oss.str();
+        return m_logger;
     }
 
 
-    std::string OpmLog::prefixMessage(MessageType messageType, const std::string& message) {
-        std::string prefix;
-        switch (messageType) {
-        case Note:
-            prefix = "note";
-            break;
-        case Warning:
-            prefix = "warning";
-            break;
-        case Error:
-            prefix = "error";
-            break;
-        default:
-            throw std::invalid_argument("Unhandled messagetype");
-        }
-
-        return prefix + ": " + message;
-    }
-
-    /*
-    std::shared_ptr<MessageCounter> OpmLog::getMessageCounter() {
-          if (!m_logger)
-          m_logger.reset( new MessageCounter() );
-
-          return m_logger;
-    }
-    */
-
-    void OpmLog::addMessage(MessageType messageType , const std::string& message) {
-        /*
-          auto logger = OpmLog::getMessageCounter();
-          logger->addMessage( "" , -1 , messageType , message );
-        */
+    void OpmLog::addMessage(int64_t messageFlag , const std::string& message) {
+        auto logger = OpmLog::getLogger();
+        logger->addMessage( messageFlag , message );
     }
 
 
 /******************************************************************/
 
-    //std::shared_ptr<MessageCounter> OpmLog::m_logger;
+    std::shared_ptr<Logger> OpmLog::m_logger;
 }