[Spreadsheet] add tooltip for alias line edit. Also, per user request, make it so when creating a new spreadsheet it is open for viewing/editing

src/Mod/Spreadsheet/Gui/Command.cpp

@@ -868,6 +868,8 @@ void CmdCreateSpreadsheet::activated(int iMsg)
 
     openCommand("Create Spreadsheet");
     doCommand(Doc,"App.activeDocument().addObject('Spreadsheet::Sheet','%s\')",FeatName.c_str());
+    doCommand(Gui,"Gui.Selection.clearSelection()\n");
+    doCommand(Gui,"Gui.Selection.addSelection(App.activeDocument().Name,'%s\')",FeatName.c_str());
     commitCommand();
 }
 

src/Mod/Spreadsheet/Gui/Sheet.ui

@@ -48,6 +48,10 @@
        <property name="enabled">
         <bool>false</bool>
        </property>
+       <property name="toolTip">
+       <string>Refer to cell by alias, for example\n Spreadsheet.my_alias_name instead of Spreadsheet.B1
+       </string>
+       </property>
       </widget>
      </item>
     </layout>