tests repaired; serious typo in the allocator fixed; fixes #32

tests/accept/compile/tos.nim

@@ -6,7 +6,7 @@ proc walkDirTree(root: string) =
   for k, f in walkDir(root):
     case k 
     of pcFile, pcLinkToFile: echo(f)
-    of pcDirectory: walkDirTree(f)
-    of pcLinkToDirectory: nil
+    of pcDir: walkDirTree(f)
+    of pcLinkToDir: nil
 
 walkDirTree(".")

tests/accept/compile/tseqcon2.nim

@@ -3,7 +3,7 @@ import os
 proc rec_dir(dir: string): seq[string] =
   result = @[]
   for kind, path in walk_dir(dir):
-    if kind == pcDirectory:
+    if kind == pcDir:
       add(result, rec_dir(path))
     else:
       add(result, path)

tests/accept/compile/twalker.nim

@@ -7,7 +7,7 @@ proc main(filter: string) =
   for filename in walkFiles(filter):
     writeln(stdout, filename)
 
-  for key, val in iterOverEnvironment():
+  for key, val in envPairs():
     writeln(stdout, key & '=' & val)
 
 main("*.nim")