Bugfixes:
- Effect dependencies sometimes went wrong. seq3 was always calculated,
even if the effect already told the upper layer, that there is an early
out available...
- On render, only free _all_ buffers, if memory usage is above the memcache
limit. This made my render times drop from 17 hours to only 4 hours on
a 2 hour movie.
Ton: I don't want to start an edit war at this point, but if you really
need the old behaviour, just use a very low, non-zero memcache limit in the
preferences. (In most cases, the default of 32 Mb _is_ very low ;-)
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