Release candidate announcement - 4.0.0-rc1

The XRootD 4.0.0 release candidate 1 has been tagged. Please follow the links below for the source and the RPMs. Please note that the RPMs have been pushed to the testing yum repositories, however, the packages have been renamed to xrootd4, so they need to be explicitly installed.

Note: Corresponding python packages will follow later this week.