hardlink: extract topic text logic of copyfiles
The topic text shows whether it's "linking" or "copying", based on
"hardlink" value. The function is extracted so a later patch can reuse it.
%include map-cmdline.default
changeset = '{cset}{branches}{bookmarks}{tags}{lphase}{parents}{user}{ldate}{summary}\n'
changeset_verbose = '{cset}{branches}{bookmarks}{tags}{lphase}{parents}{user}{ldate}{lfiles}{lfile_copies_switch}{description}\n'