[imp] logging everyone out

[Andrew Draskoy]

Thanks - I'll play with this.  When I first tried it any active sessions
would hang, and in one case eventually generated:
	
ORA-00001: unique constraint
(WEBMAIL.PK_ACTIVE_SESSIONS) violated 
Query :"insert into active_sessions ( sid, name, val, changed )
values ('e469dffe187d1964a8327170998abecd', 'HordeSession',
'base64:JHRoaXMtPmluID0gJyc7ICR0aGlzLT5wdCA9IGFycmF5KCk7IA==',
'20001128125612')" 

I'll experiment a bit more...

Andrew