v0.0.16

For most users, the updates to the README, noting compatibility with Big Sur developer beta 3, may actually be the most important aspect of this release.

There is just one actual code change: The boot option "cs_debug=1" is no longer patched into the installer USB, so verbose boot when booting from the installer USB is far less verbose (and possibly a little faster). This change makes no difference to the behavior of verbose boot during the actual installation or when booting the installed system. If you don't use verbose boot, then there is no difference versus v0.0.15.