- 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

tclCommands/TclCommandSubtractPoly.py

@@ -11,6 +11,9 @@ class TclCommandSubtractPoly(TclCommandSignaled):
     # array of all command aliases, to be able use  old names for backward compatibility (add_poly, add_polygon)
     aliases = ['subtract_poly']
 
+    description = '%s %s' % ("--", "Subtract polygon from the given Geometry object. "
+                                   "The coordinates are provided in X Y pairs.")
+
     # Dictionary of types from Tcl command, needs to be ordered.
     # For positional arguments
     arg_names = collections.OrderedDict([