[boost] [1.50.0] Release candidate 2 available for testing

Release candidate 2 files for 1.50.0 are available at http://boost.cowic.de/rc/ RC 2 is supposed to fix the --layout build problems reported for RC 1. As always, the release managers would appreciate it if you download the candidate of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy. This helps ensure the candidates build OK before we push them out to SourceForge. Thanks, --Beman --PS: I tested the 7z version, and it built without errors on Win7/VC++ Express 2010 sp1