Change travel command back to Ctrl-G as per FR 2016089.

Lemuel is right in that 'G' needs just as many keypresses as 'Ctrl-g' (other than Ctrl-O -> o) and that it should follow the same pattern as the comparable commands (Ctrl-F, Ctrl-W).

If I've overlooked other places where this command is mentioned they need to be updated.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@6502 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on July 11, 2008
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