Merge branch 'fix_query_performance' into 'master'

Fixed query error impacting performances in inventory

This merge request is fixing and error in several queries impacting significantly performances if there are a big number of orders in the database.
Replaced:
vtiger_invoice_recurring_info.start_period = vtiger_salesorder.salesorderid
With:
vtiger_invoice_recurring_info.salesorderid = vtiger_salesorder.salesorderid

See merge request !842