Fix shellcheck SC2230
> which is non-standard. Use builtin 'command -v' instead.

Once applied to everything concerning OpenWrt we can disable the busybox
feature `which` and save 3.8kB.

Signed-off-by: Paul Spooren <mail@aparcar.org>

This results in minor metadata changes (spaces).
No need to bump release.

Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>

trafficshaper create QoS rules to limit (or reserve) traffic used
by classes of clients.

Uplink and downlink can be controled (or not controlled) independently.

Client classes are defined by its network addresses (IPv4 or IPv6). Each
client class can define absolute or relative (to wan) bandwith, and also
the use (or not) of spare wan bandwidth when avaiable.

Signed-off-by: Luiz Angelo Daros de Luca <luizluca@gmail.com>