Renaming proposal for `fix_ratio_out_in_unit_flow` and friends

[mihlema]

As discussed during our last developer meeting I'd like to suggest the following renaming idea: Every out and every in are replaced with to_node and from_node respectively. We hope that this way, it might be more clear for users to intuitively understand in which order the objects for the unit_node_node relationship class need to be defined. As an example, fix_ratio_out_in_unit_flow becomes fix_ratio_unit_flow_to_node_from_node (Note: we have also reversed the order, unit_flow is now before the two nodes in order to better correspond to the order in the parameter defining relationship class unit__node__node). @jkiviluo @DillonJ let me know what you think about this

[manuelma]

Is it fix_ratio_from_node_to_node_unit_flow?

[mihlema]

We talked about this during our last SpineOpt call. Renaming is possible to fix_ratio_unit_flow_to_node_from_node. Migration/upgrade will be necessary. Leaving this open until finalized.

[clizbe]

Closing due to stale status.

[clizbe]

@mihlema Is this still a discussion or did we decide to do this?