fix some errors, rest are due to runtime parameters

lib/bouncer/backends/v0/accept.go

lib/bouncer/backends/v0/errors.go

lib/bouncer/backends/v0/query.go

lib/bouncer/frontends/v0/accept.go

lib/gat/pool.go

lib/gat/pooler.go

lib/gat/pools/session/pool.go

lib/gat/pools/transaction/pool.go

lib/gat/pools/transaction/recipe.go

lib/perror/error.go