Dode common in plugins using schema have been factorised in pubsub schema plugin, and filters users in tickets handling have been renamed in a more generic way and put there too.
"reporter*" fields in tickets have been renamed to "author*" as it is a more generic term which can be used elsewhere.
The use of new utils.partial function make easy the creation of simple plugins using schema.
this plugin allows to handle merge requests (i.e. requests to include a contribution in a project) by extendings tickets management.
This plugin is made to be generic, independent from end user tools and from the kind of project where the contribution is requested to be merged.
