#7 Sum remove features

[Aaron Hamid]

Sum->Remove needs to work on Element tab. The
table needs to support multiple selection. Currently
it repops-up the popup menu.

[Aaron Hamid]

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user_id=1290

Looks like it has been disabled pending "undo" support:

in corina.editor.EditorSumMenu:

// remove item
remMenu = Builder.makeMenuItem("element_remove");
remMenu.addActionListener(new AbstractAction() {
public void actionPerformed(ActionEvent e) {
// DISABLED: elemPanel.removeSelectedRows();
// fixme: make this undoable
}
});
add(remMenu);