cubicweb-trackervcs #1503309 add column "patch" to table of tickets [validation pending]

When displaying a table of tickets, as in the "ticket" tab of a projet, add a column "patch" that shows/links the patches attached to that ticket.

prioritynormal
typeenhancement
done in0.8.0
load0.200
load left0.000
closed by#dc00484ced31 add patch column to tickets table. Closes #1503309