Merge branch '25-BUG-string-default-value' into 'master'

Bug25 corrected Now string are correctly evaluated

Closes #25

See merge request !14

qOpenFileWidget.py

@@ -92,7 +92,11 @@ class QFunctionFormular(QWidget):
         if self.optionalArgs != ():
             # make a QLineEdit with default variable for each optionalArgs
             for arg, default in zip(self.optionalArgs, self.defaultValues):
-                self.wOptionalArgs.append(QLineEdit(str(default), self))
+                if isinstance(default, str):
+                    strDefault = "'" + default + "'"
+                else:
+                    strDefault = default
+                self.wOptionalArgs.append(QLineEdit(str(strDefault), self))
                 self.layout.addRow(str(arg), self.wOptionalArgs[-1])
         
         # make a QLineEdit for the args