feat: licenses administration basic authentication.

feat: accounts slug.
feat: duplicate accounts_balance table and merge balance with accounts table.
feat: refactoring customers and vendors.
feat: system user soft deleting.
feat: preventing build tenant database without any subscription.
feat: remove 'password' property from 'req.user' object.
feat: refactoring JournalPoster class.
feat: delete duplicated directories and files.

server/src/database/migrations/20200104232647_create_accounts_transactions_table.js

@@ -13,6 +13,7 @@ exports.up = function(knex) {
     table.string('note');
     table.boolean('draft').defaultTo(false);
     table.integer('user_id').unsigned();
+    table.integer('index').unsigned();
     table.date('date');
     table.timestamps();
   }).raw('ALTER TABLE `ACCOUNTS_TRANSACTIONS` AUTO_INCREMENT = 1000');