1. Due to a weakness in CINT (privacy level of nested classies is hard

to get to),  we need re-instate the '#define private public' trick which
is still required to properly deal with nested private and protected
classes ...  This shall be visited again when Cint has been fully upgraded
to use Reflex.

2. Delay the construction of the CollectionProxy object to when the TClass
object is created.  The dictionary now depend on the light weight TCollectionProxyInfo
instead of TCollectionProxy (which depends on the I/O).  This new object
is stored in the TGenericClassInfo.

3. The dependency of TCollectionProxy is added __only__ when required by the
content of the dictionary


git-svn-id: http://root.cern.ch/svn/root/trunk@17626 27541ba8-7e3a-0410-8455-c3a389f83636