Save order for JetAlgorithms

[cvermilion]

JetAlgorithms should be run in the order they were added to JetBuilder. Otherwise, children are not necessarily run after parents! This is currently solved with the convention that children have names starting with the parent name, and hence come later alphabetically. But this is a stupid solution, since the convention should not be necessary, and in any case, the algorithms are not guaranteed to be ordered alphabetically!