no normalizer, a_nvals = a_vals.

Fix up for SLAP_NVALUES_ON_DISK

Make SLAP_NVALUES the default.

connection_pool_max/2 operations already executing. May want to tune
this to a higher value, e.g. connection_pool_max - XX, etc. Fix in
result.c throttles the connection too late, all threads are already
consumed by the time the send buffer blocks.

writing responses. This may not be the right fix.