----------------
- Optimise the local roles plugin for the common case where
local_roles is empty
[dreamcatcher]
- the plone user was assuming a one to one mapping between property plugin
and user property sheet, and stripping away additional ones as part of
the retrieval of ordered sheets, instead, it now stores all
propertysheets in an ordered dictionary, so this assumption is not needed
[k_vertigo]
- More postonly security changes
[alecm, ramon]