Sequential Builder building from bottom to top?

[nkemnitz]

From internal discussion:

@nkemnitz:

An issue I regular run into with my larger specs is RuntimeError: The infofile at ... does not exist, but the infospec given is empty with no reference path. That is technically correct. At time of check, the info file will not exist. It's usually a subsequent step that uses the result of the previous step (and for which I don't have a useful reference). How do you handle these situations?

@trivoldus28

I think this is an issue I was facing (things building not in order) but that was months ago

@supersergiy:

i think even the sequential builder does it bottom up now, starting from leafs nodes and coming up to parents instead of doing it in order like it did before