Add in Dave's comments, and expand information in XML output to include action names, sources, properties, bjam info, and platform info. This required one minor change to actions to keep track of the action object generating the targets.

[SVN r41174]

tools/build

@@ -1 +1 @@
-Subproject commit 823d54698ba2f9c6ae45ecc2359fd9f0e27f93ee
+Subproject commit 020239be9680568d25a7c0a859d587b4f4f93279