randmanager, randomc.h updates

randmanager: use QVectors instead of QLists
             Create random generator on the stack instead of on the
	     heap.

randomop.c: create an empty constructor so the random generator can
            be created on the stack instead of on the heap, and then
	    initialized in line.
testparm.h: add new vectors for max and min operand limits

Still a work in progress, so this is only being checked in so we don't
lose track of the changes.