Mark the end of the beta phase for the net installer The 'net installer' is a self-extracting archive containing a minimal set of files needed to bootstrap an entire development environment to compile and run Git for Windows. When run as executable, it automatically runs `setup-git-sdk.bat` after extracting the files. Users who prefer to unpack the archive manually with 7-Zip need to run that batch file manually, too. The files contained in the net installer are parts of MSys2's 'msys2-runtime', 'pacman' and 'gnupg' packages, carefully selected to keep the size of the installer small yet still allowing to use the Pacman package manager to initialize a full-fledged MSys2 environment plus Git for Windows' packages. The bootstrap script needs to force-install the packages because the net installer comes without any package information and Pacman would therefore refuse to overwrite the files from above-mentioned packages. To keep the development environment up-to-date, developers need to run pacman -Syu from time to time. There is one caveat, though: if this wants to update the msys2-runtime itself, it is *highly* recommended to close all other MSys2 programs (e.g. terminal windows, Bash sessions, etc) and update msys2-runtime individually, immediately close the window (i.e. *not* run `exit`) and then restart the update in a new window. The reason: pacman itself is linked to the msys2-runtime, and updating the runtime "in flight" results most often in heap corruption as far as MSys2 is concerned. For the same reason, updates to Bash and Pacman itself should be handled in the same manner. An alternative method is to start `git-cmd.exe` and run `pacman -Sy <package>` for `msys2-runtime`, `bash` and `pacman` as needed, because that ensures that no obsolete binary continues to be used after the update. The idea for the 'net installer' originated in the Git for Windows project when it was still based on MSys 1.x. At that time, MSys 1.x did not have a package manager, therefore the original net installer (ab-)used Git as a package manager. Since the new net installer no longer needs to ship with Git (instead using Pacman to install the mingw-w64-git package that is current at the time the net installer is launched), its versions are no longer tightly coupled to the Git version. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>