Some cleanup, adding documentation.

Addition of common whitespace defenitions.
Addition of is-whitespace rule.


[SVN r19104]

tools/build

@@ -1 +1 @@
-Subproject commit 1760f25f875fc8c06ca6481de42a1a1501298041
+Subproject commit a8325f386df25b6dc4dc458c9ba04abc38288e9f