Generate launchers of penetration and shadow randomly.

The chances of getting each ego when branding, new and (old):

flame 25% (37.5%) frost 25% (37.5%) penetration 15% (N/A) shadow 15% (N/A) protection 12% (17%) vorpal 6% (6%) speed 2% (2%)

Hopefully, the chances for new brands are sufficient for testing. I didn't up the generation of launchers, or chances of the launcher getting an ego.

Signed-off-by: Eino Keskitalo <evktalo@users.sourceforge.net>

Created by  Eino Keskitalo  on October 18, 2009
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