Also allows us to gradually convert static to dynamic sizes.

Use it in CINT7 thoughout, and in CINT5 in the places that were most urgent according to a stack usage evaluation with http://home.cern.ch/axel/stacksize.sh, i.e. in G__interpret_function only for now.

Fix the lookup's conversion vs. promotion algorithm; especially the promotion part was completely wrong. This fixes Savannah #23352.


git-svn-id: http://root.cern.ch/svn/root/trunk@24073 27541ba8-7e3a-0410-8455-c3a389f83636