tests/test-hgk.t

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).

Minimal hgk check

  $ echo "[extensions]" >> $HGRCPATH
  $ echo "hgk=" >> $HGRCPATH
  $ hg init repo
  $ cd repo
  $ echo a > a
  $ hg ci -Am adda
  adding a
  $ hg debug-cat-file commit 0
  tree a0c8bcbbb45c
  parent 000000000000
  author test 0 0
  committer test 0 0
  revision 0
  branch default
  
  adda