Fixed MString and MFile.

MString.cpp

@@ -11,6 +11,7 @@
 #include <unistd.h>
 #include <fcntl.h>
 #include <cctype>
+#include <fstream>
 
 namespace coreutils {
    
@@ -216,6 +217,13 @@ namespace coreutils {
       return *this;
    }
 
+   MString &MString::operator<<(std::ifstream &pf) {
+      std::string line;
+      while(std::getline(pf, line)) 
+	*this << line << '\n';      
+      return *this;
+   }
+   
 //   MString &operator<<(std::ostream &out) {
 //      *this << out;
 //   }