pull changes from the specified source

Pull changes from a remote repository to a local one.

This finds all changes from the repository at the specified path
or URL and adds them to the local repository. By default, this
does not update the copy of the project in the working directory.

Valid URLs are of the form:

	local/filesystem/path (or file://local/filesystem/path)
	http://[user@]host[:port]/[path]
	https://[user@]host[:port]/[path]
	ssh://[user@]host[:port]/[path]
	static-http://host[:port]/[path]

Paths in the local filesystem can either point to Mercurial
repositories or to bundle files (as created by 'hg bundle' or
'hg incoming --bundle'). The static-http:// protocol, albeit slow,
allows access to a Mercurial repository where you simply use a web
server to publish the .hg directory as static content.

An optional identifier after # indicates a particular branch, tag,
or changeset to pull.

Some notes about using SSH with Mercurial:
- SSH requires an accessible shell account on the destination machine
  and a copy of hg in the remote path or specified with as remotecmd.
- path is relative to the remote user's home directory by default.
  Use an extra slash at the start of a path to specify an absolute path:
  ssh://example.com//tmp/repository
- Mercurial doesn't use its own compression via SSH; the right thing
  to do is to configure it in your ~/.ssh/config, e.g.:
    Host *.mylocalnetwork.example.com
      Compression no
    Host *
      Compression yes
  Alternatively specify "ssh -C" as your ssh command in your hgrc or
  with the --ssh command line option.