kernel/qio: big cleanup of qio functions

remove bl2mem(), it is broken. a fault while copying to memory
yields a partially freed block list. it can be simply replaced
by readblist() and freeblist(), which we also use for qcopy()
now.

remove mem2bl(), and handle putting back remainer from a short
read internally (splitblock()) avoiding the releasing and re-
acquiering of the ilock.

always attempt to free blocks outside of the ilock.

have qaddlist() return the number of bytes enqueued, which
avoids walking the block list twice.

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