undo: add "deprecated" message to output.

reduce memory used by util.opener when making a temp copy of a file.

reduce memory used when appendfile appends to real file.

New make targets: local: build extensions inplace (the former "all" target") all: "local" (for people who expect this) and build everything else install: install pre-built things (so root doesn't have to write to $HOME) install-home: use setup.py's --home option instead of --prefix

New make target "dist-notests" to create tarballs without running tests first.

Added install target.

Always remove appendopener tmp files (fixes issue235). test-hup triggered this bug by killing "hg serve --stdio".

gpg extension: Always remove temporary files created by 'hg sigcheck'.