* fix checking of customer_group & territory of customer in loyalty program
* fetch and set applicable loyalty program
- in customer.py if found 1 program, set it or show a message to set it manually
- in sales invoice, if found 1 program for selected customer with no program set, set it else open a dialog with applicable options
* removed disabled field, added from_date & to_date
* loyalty program section made collapsible, added redeem check in it
* setting loyalty program improvised, manual selection if multiple found
* get_query added, amount calculation updated
* args passed rectified for expiry_date
* get loyalty_points logic improv, redemption_details logic added
* improv based on from/to date and other rectification
* code rectified based on different scenarios
- is_return, cancel, make loyalty points entry improv
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