BUG: MANTIS-1267: Fixed minimum size lower-bound of GDAL overview to 1.

Modules/Visualization/MonteverdiGui/src/mvdMultiResolutionPyramidWidget.ui

@@ -169,6 +169,9 @@
      <property name="toolTip">
       <string>Minimal size (in pixels) of smallest overview level</string>
      </property>
+     <property name="minimum">
+      <number>1</number>
+     </property>
     </widget>
    </item>
    <item row="3" column="0" colspan="4">