Add top-level bootstrap.jam, so that users can put Boost.Build root in

boost-build rule invocation, not path to "kernel". Tweak Boost.Build place
in CVS in docs.


[SVN r20535]

tools/build

@@ -1 +1 @@
-Subproject commit 88783cf4e3dfee420ad2ef424aed1b704983604c
+Subproject commit ce55fd0f1bfa8489f0716f9ddb49be0960578625