Solver manager

Because of #142 (closed) I can't write a proper markdown-based description thus I upload a screenshort ...

• remove former StateBlock notification list
• StateBlock::getState returns by copy
• remove StateBlock::getPtr

src/make_unique.h

+/**
+ * \file make_unique.h
+ *
+ *  Created on: Oct 11, 2017
+ *  \author: Jeremie Deray
+ */
+
+#ifndef _WOLF_MAKE_UNIQUE_H_
+#define _WOLF_MAKE_UNIQUE_H_
+
+#include <memory>
+
+namespace wolf {
+
+/// @note this appears only in cpp14
+template <typename T, typename... Args>
+std::unique_ptr<T> make_unique(Args&&... args)
+{
+  return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
+}
+
+}
+
+#endif /* _WOLF_MAKE_UNIQUE_H_ */