revset: cache alias expansions Caching has no performance effect on the revset aliases which triggered the recent recursive evaluation bug. I wrote it not to feel bad about expanding several times the same complicated expression.

base85: use Py_ssize_t for string lengths

hg-ssh: read-only flag Allows you to restrict a ssh key to have read-only access to a set of repos by passing the --read-only flag to hg-ssh. This is useful in an environment where the number of unix users you can or are willing to create is limited. In such an environment, multiple users or applications will share a single unix account. Some of those applications will likely need read-only access to the repository. This change makes it possible to grant them such access without requiring that they use a separate unix account.

bookmarks: allow existing remote bookmarks to become heads when pushing

util: subclass deque for Python 2.4 backwards compatibility It turns out that Python 2.4's deque type is lacking a remove method. We can't implement remove in terms of find, because it doesn't have find either.

merge with stable