note that the first step on the buffercache is to disentangle the buffer
cache and the buffer I/O path.

Update roadmaps, unilaterally, because most of these hadn't been touched
since the pre-6.0 period and nobody else has been doing the work. There's
a lot of things whose current state I don't know; please fill in. Also the
stuff I've added is necessarily biased towards projects I think about, so
please add more.

Update roadmaps, unilaterally, because most of these hadn't been touched
since the pre-6.0 period and nobody else has been doing the work. There's
a lot of things whose current state I don't know; please fill in. Also the
stuff I've added is necessarily biased towards projects I think about, so
please add more.