Added mathmech

+ added files
* bug fix in mm_trj

mathmech/errorwindow.cpp

@@ -0,0 +1,63 @@
+#include "errorwindow.h"
+#include "ui_errorwindow.h"
+
+ErrorWindow::ErrorWindow(QWidget *parent) :
+  QMainWindow(parent),
+  ui(new Ui::ErrorWindow)
+{
+  ui->setupUi(this);
+}
+
+ErrorWindow::~ErrorWindow()
+{
+  delete ui;
+}
+
+void ErrorWindow::set_message(QString language, int mess)
+{
+  QString message;
+  if (language == QString("eng"))
+  {
+    switch(mess)
+    {
+      case 0:
+        message = QString("Work directory does not exists");
+        break;
+      case 1:
+        message = QString("Input file does not exists");
+        break;
+      case 2:
+        message = QString("Number of steps is not set");
+        break;
+      case 3:
+        message = QString("Atom types file does not exists");
+        break;
+      case 4:
+        message = QString("Output file is not set");
+        break;
+      case 5:
+        message = QString("Number of total types is not set");
+        break;
+      case 6:
+        message = QString("Log file is not set");
+        break;
+      case 7:
+        message = QString("Component is not found");
+        break;
+      case 8:
+        message = QString("Cell size is not set");
+        break;
+      case 9:
+        message = QString("Atom types are not set");
+        break;
+      case 10:
+        message = QString ("Interactions are not set");
+        break;
+      case 11:
+        message = QString ("Depth is not set");
+        break;
+    }
+  }
+
+  ui->label->setText(message);
+}