[IMP]purchase_ux: improve purchase bill line match view

[fw-bot-adhoc]

Forward-Port-Of: #300

[roboadhoc]

[fw-bot-adhoc]

@mav-adhoc @jcadhoc cherrypicking of pull request #300 failed.

stdout:

Auto-merging purchase_ux/__manifest__.py
CONFLICT (content): Merge conflict in purchase_ux/__manifest__.py
Auto-merging purchase_ux/i18n/es.po
Auto-merging purchase_ux/models/__init__.py
CONFLICT (content): Merge conflict in purchase_ux/models/__init__.py
Auto-merging purchase_ux/models/account_move.py
Auto-merging purchase_ux/models/purchase_order.py

Either perform the forward-port manually (and push to this branch, proceeding as usual) or close this PR (maybe?).

In the former case, you may want to edit this PR message as well.

⚠️ after resolving this conflict, you will need to merge it via @roboadhoc.

More info at https://github.com/odoo/odoo/wiki/Mergebot#forward-port