new const TYPE& Dummy::Get<TYPE>(), use for all Dummy::Whatever() functions

iterator typedefs are now const_iterator typedefs
Re-write NameLookup as a templated func to prevent code dumplication - now implemented for Scopes and Types. Add forwarders to Scope/ScopeBase.
Add private op int() to Scope and Type, to catch Scope/tagnum and Type/typenum conversions in cint.merge_reflex. Protected by #ifdef REFLEX_CINT_MERGE


git-svn-id: http://root.cern.ch/svn/root/trunk@16122 27541ba8-7e3a-0410-8455-c3a389f83636