Factor TROOT::IsRootFile
Add TProtoClass to TClassTable
Properly count the number of TClassRec created/added.
libCling now depend and link against libRIO
Load TClassProto into the TClassTable
Add TClassTable::GetProto
Must set fBase and fData before fRealData to avoid loading header

Also make copy only the part of fBits we should be copying
Do not try to remove 0 value from declId map
Look first for the TProtoClass then for the ClassInfo
Work-around IOLIB not be set 'yet' to fix dependency tracking
Use HasInterpreterInfo
When loading a dict, properly handle TClassRec created via a TProtoClass
Make the loading of the root pcm more quiet when gDebug is not zero
Record that we are in the process of unloading TClass to avoid asking for itself loading in the process!
Return status code in FillTClass