Various restructure of test framework handling of paths to avoid duplicate path editing which caused failed tests. Adjust many tests to deal with added subdirectories in build outputs now that toolset requirements are active.
Related changes:
* BoostBuild.Tester & TestCmd.TestCmd interfaces now accept external process parameters as a list of strings, thus avoiding problems with parsing arguments containing spaces.
* Avoided a potential process hang in case an external process being run prints out enough output to fill up the OS's pipe buffer (OS would pause the process until someone read the data from the pipe but the testing framework would not do this until the process in question had terminated).
[SVN r79448]
not by project attribute. The problem with the previous interface was
that it was not possible to mark target as explicit anywhere else,
such as in helper module which declares target in project module, or
in toolset module.
* new/targets.jam
(project-target.mark-target-as-explicit): New rule
(project-target.targets-to-build): Use self.explicit-targets.
* new/project.jam
(project-attributes.set): Don't allow 'explicit-targets'.
[SVN r18900]
