Implemented getting build request from the command line.
* new/build-request.jam (from-command-line): New rule.
* new/build-system.jam: Get build request from the command line,
expand it and pass to 'generate' rules.
* new/targets.jam: Use targets's properties when computing path.
* test/project_test3.py: Test the above changes.
[SVN r14283]
Vladimir Prus