Interpreter::process now uses Evaluate() features for value yes / no, wrap yes...

Interpreter::process now uses Evaluate() features for value yes / no, wrap yes / no, and running the function. Again reducing the line count...
Keep printAST also for declare()
Silence diagnostics for all code paths through Evaluate().


git-svn-id: http://root.cern.ch/svn/root/trunk@43967 27541ba8-7e3a-0410-8455-c3a389f83636