MT#5879 Create default invoice email template.

Allow null reseller_id for very default email templates,
which will be used to create default reseller templates.

db_scripts/diff/15060.down

@@ -0,0 +1,9 @@
+USE billing;
+
+ALTER TABLE contracts
+  DROP COLUMN invoice_email_template_id;
+ALTER TABLE email_templates modify reseller_id int(11) unsigned not null;
+
+delete from email_templates where reseller_id is null and name='subscriber_default_email'; 
+delete from email_templates where reseller_id is null and name='passreset_default_email'; 
+delete from email_templates where reseller_id is null and name='invoice_default_email'; 

db_scripts/diff/15060.up

@@ -0,0 +1,34 @@
+USE billing;
+
+ALTER TABLE contracts
+  ADD COLUMN invoice_email_template_id int(11) unsigned DEFAULT NULL;
+--we will keep very default templates with reseller_id=null to create new reseller templates when create resellers
+ALTER TABLE email_templates modify reseller_id int(11) unsigned;
+
+insert into email_templates (reseller_id,name,from_email,subject,body)values(null,'subscriber_default_email','default@sipwise.com',
+'Dear Customer,
+
+A new subscriber [% subscriber %] has been created for you.
+
+Your faithful Sipwise system
+
+-- 
+This is an automatically generated message. Do not reply.');
+insert into email_templates (reseller_id,name,from_email,subject,body)values(null,'passreset_default_email','default@sipwise.com',
+'Dear Customer,
+
+Please go to [% url %] to set your password and log into your self-care interface.
+
+Your faithful Sipwise system
+
+-- 
+This is an automatically generated message. Do not reply.');
+insert into email_templates (reseller_id,name,from_email,subject,body)values(null,'invoice_default_email','default@sipwise.com',
+'Invoice #[%invoice.serial%] | Dear Customer,
+
+Please find your invoice #[%invoice.serial%] for [%invoice.month%], [%invoice.year%] in attachment of this letter.
+
+Your faithful Sipwise system
+
+--
+This is an automatically generated message. Do not reply.');