HEADS-UP: portupgrade and pkgdb.db failures

[Sergey Matveychuk]

Please note:
If you got problem with pkgdb.db (and INDEX.db) file afrer upgrade
portupgrade, remove it (them) and restart portupgrade.
(It was described in man page.)

It's possible you'll get *.db brackage. It'll happen if you selected
WITH_BDB4 option and thought you have *.db in bdb2+ format. But it was
wrong, you had bases in dbd format. Now it's fixed and you'll have
honest bdb format, but you should remove databases files first.
-- 
Dixi.
Sem.