- multiple fixes in the Tcl commands (especially regarding the interchange between True/false and 1/0 values)

- updated the help for all Tcl Commands
- in Tcl Shell, the 'help' command will add also a brief description for each command in the list

FlatCAMObj.py

@@ -7505,7 +7505,7 @@ class FlatCAMCNCjob(FlatCAMObj, CNCjob):
                 self.app.inform.emit('[ERROR] %s' % _("There is no preprocessor file."))
 
     def get_gcode(self, preamble='', postamble=''):
-        # we need this to be able get_gcode separatelly for shell command export_gcode
+        # we need this to be able get_gcode separately for shell command export_gcode
         return preamble + '\n' + self.gcode + "\n" + postamble
 
     def get_svg(self):