make test-remove check some more cases.

tests/test-remove

@@ -5,8 +5,12 b' cd a'
 echo a > foo
 hg add foo
 hg commit -m 1 -d "1000000 0"
+hg remove
 rm foo
 hg remove foo
+hg revert
+rm foo
+hg remove --after
 hg commit -m 2 -d "1000000 0"
 hg export 0
 hg export 1

tests/test-remove.out

@@ -1,3 +1,6 b''
+abort: no files specified
+undeleting foo
+removing foo
 # HG changeset patch
 # User test
 # Node ID 8ba83d44753d6259db5ce6524974dd1174e90f47