Application: gvSIG desktop

The jython scripting console allows to remove the prompt and previous lines, which is an weird behaviour and leaves the console on a error-prone status.

I have prepared a patch that corrects this behaviour and some other problematic ones:
- Backspace no longer allows to remove the prompt or previous lines
- Allow using backspace to delete selection (it was only possible to do so using delete button till now)
- When a selection includes the prompt (or previous lines) and then del or backspace is pressed, only the text after the prompt is removed. I think this is a more natural behaviour
- When the cursor is the history area (above the prompt) and some text is inputted or some key is pressed, move the cursor to the last line (the editable area). Previously, nothing happened when a key was pressed
- Printing a unicode text variable no longer produces an exception