Converting Boost.Build v2 User Manual to BoostBook

* userman.xml - initial BoostBook version
* Jamfile.v2  - build rules for user manual


[SVN r22165]

tools/build

@@ -1 +1 @@
-Subproject commit 34fef8215883dd2417ae3a490ec70c54277ead65
+Subproject commit 1f41cd7eebc88f3374a88d21ad39644fa3589b5e