Add funder to selectable plan columns

This also changes the width of the owner and description columns to attempt to make a better fit.
A project can be associated with an Institution (through project.organisation) even if the template belongs to a Funder, so that may cause confusion. Let's go with "Template Owner" and "#template_owner" for now; we may revise the column name later once we've had feedback from others, notably Sarah, but the method name is sensible regardless.