2-DEV-151 XML update

Will be used to cut stable releases as 2.8.7.2.
Will be used to cut experimental releases as 2.9.0.0.
2.9.0.0-EXP-MAIN XML dragged out of mothballs and updated

Finally we have a use for this again! RI and ICBM will be submitted for public testing. Whether they will be Yogs-only or not in the end is pending.