Change exclusion commands.

e => set exclusion (radius 1), change radius to LOS, remove exclusion

(Because of the LOS restriction, the intermediary step of 4 is not needed any more.)

E => cycle through exclusions Ctrl-E => clear all exclusions

I also reordered the commands on the 'X' help screen.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7395 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on November 7, 2008
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