Resolve :use/:only refers, refer-aware syntax-quote, alias-aware resolve

Three related namespace-resolution fixes surfaced porting the clojure.tools.logging
library, all general:

- chez-register-spec! treats a :use :only vector like :require :refer, so a
  (:use [ns :only [names]]) clause actually brings those names in. Before, a bare
  reference to an :only'd name resolved to nil.
- syntax-quote (hc-sq-symbol) qualifies a referred name to its SOURCE namespace,
  not the compile namespace — so a macro that syntax-quotes a referred var (e.g.
  clojure.tools.logging/spy reaching clojure.pprint's pprint) expands correctly.
- resolve consults :as aliases and :refers like ns-resolve does; (resolve
  'alias/name) was returning nil because the alias wasn't expanded.

host/chez/host-contract.ss

@@ -225,6 +225,12 @@
           ((hc-special-symbol? nm) form)               ; special form: leave bare
           ((hc-interop-head? nm) form)                 ; interop (.method / Class. / .-field): bare
           ((var-cell-lookup "clojure.core" nm) (jolt-symbol "clojure.core" nm))
+          ;; a name referred into the compile ns (:require :refer / :use :only)
+          ;; qualifies to its SOURCE ns, not the compile ns — so a macro that
+          ;; syntax-quotes a referred var (e.g. clojure.tools.logging/spy using
+          ;; clojure.pprint's pprint) expands to the real var.
+          ((chez-resolve-refer (chez-actx-cns ctx) nm)
+           => (lambda (target) (jolt-symbol target nm)))
           (else (jolt-symbol (chez-actx-cns ctx) nm)))  ; else: qualify to compile ns
         ;; qualified: if the ns part is an :as alias in the compile ns, resolve it
         ;; to the target namespace — Clojure resolves the alias part of a qualified