Reverting to 6.2-RELEASE

[Pete French]

I appear to have a machine which will not run RELENG_6_2, though it runs
the released code quite happily. Is there a CVS tag I can use to revert the
sources back to the way they were on RELEASE? I want to be able to
verify that this is and track down what changed! I don't think it should
ever be the case that something which runs X.Y-RELEASE will not run RELENG_X_Y
should it ?

-pcf.