Propagate free properties in build request to all directly requested targets.

    * targets.jam
        (abstract-target.direct-build-request): New rule.
        (project-target.direct-build-request): New rule.
        (main-target.direct-build-request): New rule.
        (main-target.generate): Use data stored by
        'direct-build-request' to adjust build properties.

    * build-system.jam: Call 'direct-build-request' on project
         target in "."

    * feature.jam (feature): Don't allow propagated free features.


[SVN r15677]

tools/build

@@ -1 +1 @@
-Subproject commit 9fa663224f42bf813fe260e8c660595eae755598
+Subproject commit 18991908fc12a7e2b07026cb21dd8c1f71c5c68e