Second beta release

- Add --unredir-if-possible-delay and --unredir-if-possible-exclude .

- Add --xinerama-shadow-crop .

- (Presumably) more reliable focus detection.

- Fix some numeric locale related issues.

- Fix some --opacity-rule related issues.

- Add D-Bus option stoppaint_force.

- Add condition matching target `x2` and `y2`.

- Add workaround for insane window type changes.

- Support CPPFLAGS.

First beta release.

Perhaps not so perfect, but I hope nothing terribly wrong, either.