Changes to MString to add insert and remove methods.

testing/mstring_test.cpp

@@ -30,6 +30,16 @@ int main(int argc, char **argv) {
    test6 << "Will this work? " << number << test4 << " See how this works.";
    std::cout << "streaming: [" << test6 << "]." << std::endl;   
 
+   coreutils::MString test9("XXXXXXXXXYYYYYYYYYY");
+   std::cout << "test insert: " << test9 << std::endl;      
+   coreutils::MString test8("zzz");
+   test9.insert(test8, 9);
+   std::cout << "inserting: " << test9 << std::endl;
+   test9.insert("aaaaa", 9);
+   std::cout << "inserting: " << test9 << std::endl;
+   test9.remove(10, 7);
+   std::cout << "removing: " << test9 << std::endl;
+   
    return 0;
 }