Move distributed places to their own package.

pkgs/distributed-places-lib/info.rkt

@@ -0,0 +1,3 @@
+#lang info
+(define collection 'multi)
+(define deps '("base"))

pkgs/racket-pkgs/racket-doc/info.rkt

@@ -6,6 +6,7 @@
                "planet-lib"
                "compatibility-lib"
 	       "net-lib"
+               "distributed-places-lib"
                "sandbox-lib"
                "compiler-lib"
                "scribble-lib"

pkgs/racket-pkgs/racket-test/info.rkt

@@ -8,6 +8,7 @@
                "sandbox-lib"
                "compatibility-lib"
                "planet-lib"
+               "distributed-places-lib"
                "pconvert-lib"
                "eli-tester"
                ;; for `net` tests

racket/lib/collects/racket/place.rkt

@@ -81,7 +81,11 @@
 (define (dynamic-place module-path function #:at [node #f] #:named [named #f])
   (cond
     [node
-      (supervise-place-at node module-path function #:named named)]
+     (unless (collection-file-path "distributed.rkt" "racket" "place"
+                                   #:fail (lambda (x) #f))
+       (raise-arguments-error "dynamic-place" 
+                              "distributed places are not available"))
+     (supervise-place-at node module-path function #:named named)]
     [else
       (start-place 'dynamic-place module-path function
                    #f (current-output-port) (current-error-port))]))