This expands out the failed and skipped summary tail lines to also include a sorted list of action and targets of the corresponding failed and skipped targets. This makes it easier to see them and to further search for individual ones in teh rest of the output. It also makes it possible to quickly retry specific targets.
fixes#196
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]
