Add new interpreter stress test. Should be run interpreted - and thus reruns...

Add new interpreter stress test. Should be run interpreted - and thus reruns itself interpreted if started as compiled code.
Tests interpreted function calls (recursive and flat), STL dictionaries, reflection retrieval (on existing and non-existing names) and reflection-based calls (aka CallFunc) and wildly nested expressions and statements.
Normalization of ROOTMARKS still needs to be fixed.


git-svn-id: http://root.cern.ch/svn/root/trunk@37819 27541ba8-7e3a-0410-8455-c3a389f83636