For 1909388: command key changes

Added init.txt option additional_macro_file, which does what you expect. Macros are read after the player's macro.txt. Documented new option.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3565 c06c8d41-db1a-0410-9941-cceddc491573

Created by  pauldubois  on March 9, 2008
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