Linux FF-interface hasn't developed much. How about adding sequences to
that interface.

Here is small test-patch which I made to look what kind of problems
there might be. This is ff-memless only because I wanted to reuse it's
timer system. Also, it's not optimized (kind of ugly hack :). Anyway, it
shows some problematic things, like custom_data pointer state, ownership
of effect and is effect still enabled. Moving to ff-core solves most of
these.

More generic way to do this would be at ff-core, so all ff-devices could
use it, but thats not a simple task (timers..). Also kind of misusing
custom-field is probably not so good thing :). Maybe adding new type or
something.

So, what you think? Does this make any sense?

	++Jam