- added more key shortcuts into the application; they are now displayed in the GUI menu's

- reorganized the Edit -> Preferences -> Global
- redesigned the messagebox that is showed when quiting ot creating a New Project: now it has an option ('Cancel') to abort the process returning to the app

flatcamTools/ToolCalculators.py

@@ -141,6 +141,9 @@ class ToolCalculator(FlatCAMTool):
         FlatCAMTool.run(self)
         self.app.ui.notebook.setTabText(2, "Calc. Tool")
 
+    def install(self, icon=None, separator=None, **kwargs):
+        FlatCAMTool.install(self, icon, separator, shortcut='ALT+C', **kwargs)
+
     def on_calculate_tool_dia(self):
         # Calculation:
         # Manufacturer gives total angle of the the tip but we need only half of it