read-eval is true during load
doc enhancements to read, read-string
doc *read-whitelist*
added safe-read, safe-read-string
allow only find-ns
*read-eval* false back to kill switch for all #=
non-record use of record read syntax requires *read-eval* == true
whitelist mode of read-eval is now :default, (precisely) true turns everything on, logical false everything off
read-string returns nil when string is nil or empty
Merge branch 'master' of github.com:clojure/clojure