Make hg add foo; hg mv foo bar work.
- foo will be removed (the user has a copy of its contents in bar)
- bar will not be marked as a copy (there was no committed version of foo).
We print a warning telling that to the user.
Fixes issue269.
% init
% commit
adding base
% qnew mqbase
% qrefresh
% qdiff
diff -r 67e992f2c4f3 base
--- a/base
+++ b/base
@@ -1,1 +1,1 @@ base
-base
+patched
% qdiff dirname
diff -r 67e992f2c4f3 base
--- a/base
+++ b/base
@@ -1,1 +1,1 @@ base
-base
+patched