[10.0][MIG][base_import_match] Migration and update

Includes:

- Normal migration steps.
- Usage of brand new `_inherit = "base"` in Odoo 10, which implies
  removing a lot of monkey-patching code.
- Log a warning when multiple matches are found.

base_import_match/__manifest__.py

@@ -0,0 +1,28 @@
+# -*- coding: utf-8 -*-
+# Copyright 2016 Grupo ESOC Ingeniería de Servicios, S.L.U. - Jairo Llopis
+# Copyright 2016 Tecnativa - Vicent Cubells
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+{
+    "name": "Base Import Match",
+    "summary": "Try to avoid duplicates before importing",
+    "version": "10.0.1.0.0",
+    "category": "Tools",
+    "website": "https://tecnativa.com",
+    "author": "Grupo ESOC Ingeniería de Servicios,"
+              "Tecnativa, "
+              "Odoo Community Association (OCA)",
+    "license": "AGPL-3",
+    "application": False,
+    "installable": True,
+    "depends": [
+        "base_import",
+    ],
+    "data": [
+        "security/ir.model.access.csv",
+        "data/base_import_match.xml",
+        "views/base_import_match_view.xml",
+    ],
+    "demo": [
+        "demo/base_import_match.xml",
+    ],
+}