keyword: support copy and rename
copy/rename destinations being unversioned and possibly ignored by
the extension should not contain expanded keywords.
Files copied/renamed from an ignored source are not touched.
Add tests covering both of the above cases, plus the corner case of
cp symlink foo; hg cp -A symlink foo (where foo becomes a regular file).
http://mercurial.selenic.com/bts/issue1438
$ "$TESTDIR/hghave" symlink || exit 80
$ hg init
$ ln -s foo link
$ hg add link
$ hg ci -mbad link
$ hg rm link
$ hg ci -mok
$ hg diff -g -r 0:1 > bad.patch
$ hg up 0
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
$ hg import --no-commit bad.patch
applying bad.patch
$ hg status
R link
? bad.patch