frameencoder: update a TODO comment
TEncSampleAdaptiveOffset: remove hungarian prefixes
log: concise is almost always better

--HG--
extra : amend_source : e6f68115ed8d5a5443f61d04033fa11332fe58f0
slice: finally remove slice 'depth' parameter, use slice type to approximate

Instead of relying on a fixed depth cadence, apply all the high-depth hacks to
only B slices.
sao: fix a typo
frameencoder: use a more refined depth for SAO
TComSlice: remove unused lambda variables