[RFA] Add 'rev' as abbreviation for 'reverse-search'

[Michael Snyder]

Bug 10688 points out that 'rev' is documented as an abbreviation for
'reverse-search', yet it no longer works because it is ambiguous with
the new reverse-execution commands (reverse-continue etc.).

This patch adds 'rev' as a command alias for 'reverse-search'.

Comments?

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