Better push in 'mfpub'

buildroot/share/git/mfpub

     # Allow working directly with the main fork
     echo
     echo -n "Pushing to origin/$TARG... "
-    git push -f origin
+    git push origin HEAD:$TARG
 
     echo
     echo -n "Pushing to upstream/$TARG... "
-    git push -f upstream
+    git push upstream HEAD:$TARG
 
   else