#8 redesign db object heirarchy

[ezra p.]

the db objects have gotten way too messy. they need to
be broken into seperate classes based on functionality;
e.g. the org.jdba.db.oracle.Table class doesn't need to
provide ALL of the table functionality and ui.
a DatabaseObjectInterface might have

public void create();
public void drop();
public void alter();
public void clone();
public ? getInfo();
public DatabaseTreeNode getNode();
public JPanel getSomethingToDisplayInMainframe...

just scratchpaddin' here...