Bug#538359: scilab: correction

[Sylvestre Ledru]

> The previous statement needs a correction:
> Installing openjdk-6-jre-headless allows to run in TUI mode with 'scilab -nogui'.
> Install openjdk-6-jre enables GUI mode.
OK, thanks

> Maybe scilab should require openjdk-6-jre-headless and recommend openjdk-6-jre?
Yep, I could do something like that.
For information, Scilab 5.2 will introduce a clear separation between
the GUI and the command line interpreter

Sylvestre