mark v7.0 unstable

since it is a major version, backward compatibility is not guaranteed

stable release v6.4

mark v6.4 unstable

WARNING: this tag is replacing the previous v7.0_unstable since released
have been delayed to after v6.4

stable release v6.3

Start Paparazzi v6.3 (unstable)

stable release v6.2

Start Paparazzi v6.2 (unstable)

stable release v6.1

First release candidate for v6.1

Start Paparazzi v6.0 (unstable)