Tigthen up interface. All feature.* rules which are not callable by

end user now require that property name is already gristed. This eliminates
the need to call 'grist' everywhere.


[SVN r21204]

tools/build

@@ -1 +1 @@
-Subproject commit 7d48ebd98108621118a25189f3b42889ef03e864
+Subproject commit 167f6c79da96599193ae9125ca4aec42410086e0