Patch to Josef's Bigvars (#855)

* Added test, fixed bug

* Added simple test for bighash

* Changing to use standard libs

* Replaced LinkedList dependency with lib

* Removed dependency on local Siphash

* Fixed up stress tests

Author: supercooldave

modules/standard/Big/Array/Supervisor.enc

@@ -3,7 +3,7 @@ module Supervisor
 
 import Worker
 
-local class Supr[t]
+local class Supr[sharable t]
     var size : int
     var numOfWorkers: int
     var workers : [(Worker[t],int,int)]

modules/standard/Big/HashMap/Collection.enc

@@ -1,7 +1,7 @@
 
 module HashEntry
 
-import LinkedList
+import Collections.Mutable.LinkedList
 
 local class HashEntry[k,v]
     var key : k
@@ -85,11 +85,7 @@ local class HashEntry[k,v]
         var index = 0
         var iterator = this.values.iterator()
         while iterator.has_next() do
-            match (iterator.next()) with
-                case Just(v) =>
-                    result(index) = v.value
-                end
-            end
+            result(index) = iterator.next()
             index += 1
         end
         result

modules/standard/Big/HashMap/HashEntry.enc

@@ -2,7 +2,7 @@
 module HashMap
 
 import Supervisorh
-import LinkedList
+import Collections.Mutable.LinkedList
 
 linear class Bighash[k,v]
     var supervisor : Supervisor[k,v]