make test-remove check some more cases.

tests/test-remove

@@ -1,17 +1,21 b''
 #!/bin/sh
 
 hg init a
 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
 hg log -p -r 0
 hg log -p -r 1
 
 cd ..
 hg clone a b

tests/test-remove.out

@@ -1,48 +1,51 b''
+abort: no files specified
+undeleting foo
+removing foo
 # HG changeset patch
 # User test
 # Node ID 8ba83d44753d6259db5ce6524974dd1174e90f47
 # Parent  0000000000000000000000000000000000000000
 1
 
 diff -r 000000000000 -r 8ba83d44753d foo
 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
 +++ b/foo	Mon Jan 12 13:46:40 1970 +0000
 @@ -0,0 +1,1 @@
 +a
 # HG changeset patch
 # User test
 # Node ID a1fce69c50d97881c5c014ab23f580f720c78678
 # Parent  8ba83d44753d6259db5ce6524974dd1174e90f47
 2
 
 diff -r 8ba83d44753d -r a1fce69c50d9 foo
 --- a/foo	Mon Jan 12 13:46:40 1970 +0000
 +++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
 @@ -1,1 +0,0 @@
 -a
 changeset:   0:8ba83d44753d
 user:        test
 date:        Mon Jan 12 13:46:40 1970 +0000
 summary:     1
 
 diff -r 000000000000 -r 8ba83d44753d foo
 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
 +++ b/foo	Mon Jan 12 13:46:40 1970 +0000
 @@ -0,0 +1,1 @@
 +a
 
 
 changeset:   1:a1fce69c50d9
 tag:         tip
 user:        test
 date:        Mon Jan 12 13:46:40 1970 +0000
 summary:     2
 
 diff -r 8ba83d44753d -r a1fce69c50d9 foo
 --- a/foo	Mon Jan 12 13:46:40 1970 +0000
 +++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
 @@ -1,1 +0,0 @@
 -a
 
 
 0 files updated, 0 files merged, 0 files removed, 0 files unresolved