* 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]