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.
% replace file with dir
initializing destination source-hg repository
scanning source...
sorting...
converting...
2 add d file
1 replace with d dir
0 add d/a
% manifest of tip
644 d/a
1 files updated, 0 files merged, 0 files removed, 0 files unresolved