tests/test-merge3

Add -m for commit and deprecate -t

Index: hg/doc/hg.1.txt
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#!/bin/sh -x

hg init
echo This is file a1 > a
hg add a
hg commit -t "commit #0" -d "0 0" -u user
touch b
hg add b
rm b
hg commit -A -t"comment #1" -d "0 0" -u user