Introduce the 'property-set' class, which is used instead of

plain old lists of properties in most cases where we need property sets.

The changes are too numerous and mostly automatic to comment each one.


[SVN r17305]

tools/build

@@ -1 +1 @@
-Subproject commit 6944a6cb233bf0664db5030e1a10837861de56be
+Subproject commit 8e8891b7ddfc7456e9d123b0c8d524a5cefeb40d