This contains significant rebase / merge / testing work by Naut
<lbrynaut@protonmail.com>, Anthony Fieroni <bvbfan@abv.bg> and Brannon
King <countprimes@gmail.com>.
Also update man pages.
Tree-SHA512: 826f3c9ad1e49902ee2f1710a4329388c0a9298a359971f21130bf8f390d4a7b744d010f04eb109666ceb28d0053b9fa7ec088caaa4e4cc38509526457086d40
Master was bumped to 0.16.99, so update the man pages too to avoid
confusion.
Tree-SHA512: 63622d6ebea2fb052ffe05fb80fe08bd627c34310a7ca22b2bc1af74003b20ab1a1fde51746ee69d401379d65232981b68541a9fc7f329e04b854507f836b19e
8c156b7 Bugfix: Only install manpages for built programs (Luke Dashjr)
Tree-SHA512: f4c40910b257274a05d9c842b9adb5d9d01df7dd2d34a18bd2d98c78810dc3ed98ed12c08c55352e36a845f06ddb1efba9d4ecf5f1123d2c58406a5ecf589836