Add Odoo resource xml checker

This script compares module resource xml files against data in Odoo
database and prints out various diagnostics.
[ADD] [8.0] 'delivery' default value for the model 'delivery.grid.line', field 'sequence';
[ADD] [8.0] 'delivery' default value for the model 'delivery.grid.line', field 'sequence';
[ADD] [8.0] 'mrp'. add pre-migration script; improve post-migration script;
[ADD] [8.0] 'portal' migration;
[ADD] [8.0] 'portal_sale' update groups and rules;
[ADD] [8.0] 'procurement migration;
[IMP] [8.0] 'purchase' migration;
[ADD] [8.0] 'sale_stock' add warehouse migration; delete workflow of 'sale.shop';
[FIX] [8.0] 'sale_stock' fix pre-migration script;
[ADD] [8.0] 'sale_stock' change action_ship_end function;
[ADD] [8.0] 'stock' migration;
[FIX] add analysis work file; revert change in analysis file
[FIX] add analysis work file
[FIX] analysis file
[FIX] 'purchase' migration: pep8 and double quote;
[FIX] 'purchase' migration. note module as done in doc
[FIX] 'purchase' get id by xml_id
[REF] 'purchase' use list comprehension;
[FIX] check for existence of legacy columns from procurement