test-clone-failure: fake output upon fifo unavailabity

hghave: detect FIFO availability

Skip test-archive-symlinks if symlinks are not available

posixfile_nt: '+' should allow read access. This fixes unexpected I/O error on committing many files due to cset:8a53b39cd402 (r4902 in crew).

posixfile_nt: '+' was understood as read mode instead of update.

httprepo: quote the path part of the URL This should fix a 'hg clone "http://hg.example.org/path with spaces/"' The code tries to do the right thing when the user passes a path that's already escaped in part (e.g. "http://hg.example.org/path%20with spaces/"). If we're redirected, urllib2 will happily follow the URL it's given without escaping anything. I'm not sure what we would have to hook to work around that.

dirstate: fix rebuild; add a test If rebuild calls invalidate, it will just queue a (re)read of the dirstate file, while what we really want is to empty the current state.

hgweb: don't use os.path.join to build URL parts