Added custom options module for printers by report

corrections for travis tests

fix for flake8 errors and travis tests

added new sections and rapleced maintainers

added USAGE section in readme + bug corection for update of printers

changed copyrights

updated manifest and fix for case of false ppd

printer_custom_options/models/printer_option.py

@@ -0,0 +1,18 @@
+# Copyright 2019 Compassion
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+from odoo import fields, models
+
+
+class PrinterOption(models.Model):
+    _name = 'printer.option'
+    _description = 'Printer Option'
+    _rec_name = 'option_key'
+
+    option_key = fields.Char(required=True, readonly=True)
+    printer_id = fields.Many2one(
+        comodel_name='printing.printer',
+        string='Printer',
+        required=True,
+        readonly=True,
+        ondelete='cascade',
+    )