Don't copy hidden files/directories during `setup.py install`
This is useful if a copy of Mercurial is stored in a Subversion repository
so that the .svn directories don't get copied.
adding a
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
newline
+clean diff