run-tests: allow test output lines to be terminated with \r in addition to \n
str.splitlines could not be used in 546c76e5a3e6, but _now_ we would like to
have lines with other line endings than \n.
Some fine occurences of (esc) markup of \r is replaced with multiple lines
ending with '\r (no-eol) (esc)'. That is no win but also no significant loss.
This change makes it possible to drop filtercr.py - _that_ is a win.
$ hg init
$ python -c 'file("a", "wb").write("confuse str.splitlines\nembedded\rnewline\n")'
$ hg ci -Ama -d '1 0'
adding a
$ echo clean diff >> a
$ hg ci -mb -d '2 0'
$ hg diff -r0 -r1
diff -r 107ba6f817b5 -r 310ce7989cdc a
--- a/a Thu Jan 01 00:00:01 1970 +0000
+++ b/a Thu Jan 01 00:00:02 1970 +0000
@@ -1,2 +1,3 @@
confuse str.splitlines
embedded\r (no-eol) (esc)
newline
+clean diff