[1589849] Enabled ! in targeting mode to aim beams at a specific spot.

Beams aimed at the ground will hit creatures submerged in shallow water, but enchantments will do nothing, lightning will ground harmlessly, and other conjurations will do 2/3rd their normal damage.

Made target_unshifted_dirs turn off default_target, and vice versa, since the options don't go well together.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1518 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on June 3, 2007
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