CHANGELOG: add 1.31.0v1.31.0

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+# Changes
+
+## 1.31.0
+
+- New source types `flake` and `flake-input` deliver a flake, or one input
+  of a flake as its lock file pins it, as a link into the store, with
+  garbage collector roots for its inputs.  With `fetchOnTarget`, the target
+  fetches them itself, which also works with `sudo`.
+- `inputs` draws inputs of the flake in a source from other sources, by
+  rewriting its lock file, or through a generated flake.  `flake` and
+  `flake-input` sources can also get `patches` applied, and be
+  `materialize`d as writable copies.
+- `writeDeploy` deploys a flake from a source with its new `flake`
+  parameter.
+- `prune` removes everything from the target directory that isn't a
+  configured source.
+- Populate never changes or removes anything outside the target directory:
+  a symlink at the target path of a source gets replaced instead of written
+  through, source names must be portable file names, target paths must be
+  absolute and not `/`, and `git` sources refuse work trees whose `.git`
+  directory names places elsewhere, unless `reclone` is set.
+- With rsync 3.5.0 or later, populating a `file` source fails if rsync
+  can't read `.rsync-filter` files that apply to it; `insecureLinks`
+  decides what to do instead.
+- `writeDeploy` passes `--use-remote-sudo` only with a separate
+  `buildTarget`, and `--no-flake` if `/etc/nixos/flake.nix` exists and no
+  flake gets deployed.
+- krops' flake provides krops' functions, and NixOS VM tests in `tests/`
+  cover populate.