copies-tests: add a summary of all cases created in test-copies-chain-merge.t
This helps to keep track of existing branch when adding new cases.
Differential Revision: https://phab.mercurial-scm.org/D9588
https://bz.mercurial-scm.org/1089
$ hg init
$ mkdir a
$ echo a > a/b
$ hg ci -Am m
adding a/b
$ hg rm a
removing a/b
$ hg ci -m m a
$ mkdir a b
$ echo a > a/b
$ hg ci -Am m
adding a/b
$ hg rm a
removing a/b
$ cd b
Relative delete:
$ hg ci -m m ../a
$ cd ..