[vbox-dev] Let's make our Guest OSes page better -- by coloring !

[Alexey Eremenko]

Let's devide our Guest OSes page into 4 categories, and paint them
different colors !

Green:
Tested Guest OS with GuestAdditions available.

Yellow:
Tested Guest OS without GuestAdditions available.

Orange:
Partially Test GuestVM without GuestAdditions available. (or tested,
with bugs found)

Red:
GuestVM doesn't works.

In addition, please add Win9x to the table.

-Alexey Eremenko.