Usage and key files
===================
All commands have the prefix i2pd-. Upstream's documentation uses the
unprefixed names: https://github.com/PurpleI2P/i2pd-tools

The launchers set umask 077 so newly created private keys are user-only.
Use a private directory owned by you, choose a new output filename, and
do not run these tools as root. Upstream opens output paths with ordinary
ofstream/fopen: existing files can be overwritten and symbolic links are
followed. The umask does not change permissions on an existing file.

The routerinfo firewall-output option emits Linux iptables commands; it
does not configure OpenBSD pf. The autoconf tool generates i2pd tunnel
configuration and is installed as i2pd-autoconf, not GNU autoconf.
