[Squirrel-sql-develop] Latest mods

[Colin B. <col...@bi...>]

- Show shortcuts on popup menu for undo/redo
- fixed exception when closing all SQL reult tabs and windows
- the characters -- at the beginning of a line of SQL treat the line as a
comment.
- Driver and Alias maintenace windows are now modeless.
- Aliaes and Drivers tool window now resized when Look and Feel changed (if
required).
- Now displaying SQL Error Code and State when an SQL error occurs.
- Can now select the Font for the SQL entry area.
- New "Show Native SQL" item in Session menu.
- Changes to accessing the SQL script in ISession:
	String getEntireSQLScript();
	String getSQLScriptToBeExecuted();
	void setEntireSQLScript(String sqlScript);
	void appendSQLScript(String sqlScript);
- Removed electric scroll from jEdit plugin.