replaced and deprecated attribute in schema

[Matthieu Patou]

Hi andrew,

While doing stuff on the upgradeprovision script I found some attributes 
that disappear or that are changed:

prefixMap
defaultSecurityDescriptor
mayContain
systemFlags
searchFlags
systemMayContain
systemOnly

defaultObjectCategory
possibleInferiors
rangeUpper
adminDisplayName
adminDescription

For the first part I'm quite ok to change or removed them but for the 
second as I don't know the use or the previous use of this attributes I 
am a bit more reluctant to authorize the script to replace or remove 
them. Can you tell me if it's ok to replace/remove them ?

Matthieu.