software: add manual page

Signed-off-by: Martin Stensgård <mastensg@ping.uio.no>
.gitignore: ignore generated manpage

Signed-off-by: Martin Stensgård <mastensg@ping.uio.no>
software/main: add lateness debug information

Signed-off-by: Martin Stensgård <mastensg@ping.uio.no>