[ADD] label_zpl2 and make printer_zpl2 depend to it

[etobella]

I have detected that printer_zpl2 depends on base_report_to_printer but I think it may not be the best options, because you could require zpl2 but not use the module of printers.

This PR splits the module in two. The first is label_zpl2, that creates the models and allows to render the labels. The second is printer_zpl2 that will inherit from the first.

[JordiBForgeFlow]

@sylvain-garancher As the original author of this module, it would be best if you can tell us if you're good with this proposal. Can you help us?

[max3903]

@etobella I am not sure to understand why you would split. If you create ZPL2 labels, I would assume it's to print them on a ZPL2 printers, no? Can you explain your use case? Do you plan to use one module and not the other?

[Garamotte]

Like @max3903, I don't understand the usecase, but I'm not against splitting the module if it contains several independant features, as long as everything works after the split :)

However, I think that the split should wait for the next Odoo version.
Some people may have modules depending on this version, and your split changes many things (xml_ids of the models, views, menus, etc.) that can break custom modules inheriting from this one.

[etobella]

Well, I am using odoo integrated with another software and all the printing queres are managed from the other software.
All data is stored on odoo, so I tried to generate the labels on odoo and use the printing queues from the other software. I am currently using it in order to print complex templates and I would like to use it also for labels.

[max3903]

@etobella Thanks for the explanation. It makes more sense now.

I don't mind merging this in v11 as far as the version is bumped accordingly.

[max3903]

@etobella Can you split the pull request to have one per module? Thanks.

[etobella]

I have divided the module in two. (#150)

[JordiBForgeFlow]

@sylvain-garancher @alnslang The module was migrated by you to 11.0 just two months ago. I think that it is important to coordinate the changes with you. But I do not expect many other people to use the modules. The module is not yet available in the app store for 11.0 https://www.odoo.com/apps/modules/10.0/printer_zpl2/

Also, if a person fetched all the repo the update will run correctly, and will install label_zpl2

[pedrobaeza]

More than to use it, to extend it, so the changes on XML-IDs won't affect. I think this can be very valuable for these regular contributors in this version (they can't wait for next version), and with a very little cost.

[etobella]

I cancel the PR as it will not be merged for the related problems found for migration.