Update for moving some fields to the new vnstat display.
Update for moving some fields to the new vnstat display.

Don't say that `cache' is for the buffer cache.

Describe the uselessnes of `buf'.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase