Implement path features.

    * property.jam (translate-paths): New rule.

    * targets.jam (main-target-alternative): Translate path
      properties.

    * project.jam (project-attributes.set): Likewise.

    * builtin.jam (variant): Fixes.


[SVN r15707]

tools/build

@@ -1 +1 @@
-Subproject commit 2d011cda1741d839d5533052ad9604d23f6c24d6
+Subproject commit 688f31f78c382517702c04f8442f296eb3e62445