ADDED: automatic zone refilling.

This is for the out-of-box experience for novice users.  It is presumed
that folks with larger more complicated boards will turn it off.

Fixes https://gitlab.com/kicad/code/kicad/issues/6413

include/commit.h

@@ -133,7 +133,7 @@ public:
     ///< Execute the changes.
     virtual void Push( const wxString& aMessage = wxT( "A commit" ),
                        bool aCreateUndoEntry = true, bool aSetDirtyBit = true,
-                       bool aUpdateConnectivity = true ) = 0;
+                       bool aUpdateConnectivity = true, bool aZoneFillOp = false ) = 0;
 
     ///< Revert the commit by restoring the modified items state.
     virtual void Revert() = 0;