Added mathmech

+ added files
* bug fix in mm_trj

mathmech/main.cpp

@@ -0,0 +1,14 @@
+#include "mainwindow.h"
+#include <QApplication>
+#include <QLocale>
+
+int main(int argc, char *argv[])
+{
+  QLocale::setDefault(QLocale::C);
+
+  QApplication a(argc, argv);
+  MainWindow w;
+  w.show();
+
+  return a.exec();
+}