Fix io and note

I am starting to remove "exotic" features that get the way of maintenance.

In this case:

• I removed the width control for graphInput and graphOutput. Their contents are displayed horizontally so that tuning the width seems unnecessary:

Note: the display still looks a bit funky but I plan to do a complete CSS overhaul in the next MRs.

• It is confusing for noteNode to have a field to both edit the comment and the label. The note should have a single field that can edit the text inside. Therefore, I removed the comment field for note nodes.