This adds several new manual pages to the project, ships them
using `dist` and has a simple target to recreate the new roff
files using the `ronn` utility: `make manpages`.
These man pages are still very crude and contain the absolute
minimum amount of information. I've attempted to cross link them
as much as is reasonable.
The telemetry API is documented in `telemetry(3)`. The important
functions themselves are `linked` with a ref link that should
make `man tm_create_record` (etc.) link to telemetry(3).
I attempted to make this pass `make distcheck` and `make install`
properly, but this should still be checked.
Auke Kok