Updates focusing multi-retail management

Saleculator 4.0 Update 4 #

• Multiple outlet support with database and individual receipt number sequence
• Option to keep remote connection alive to make outlet billing faster
• New method to get elapsed time of ticket since order is taken
• Caller ID device driver is loaded only if Vendor Id and Product Id is set
• Fixed issue of stock checking getting slow on sales screen
• Fixed issue of dynamic price updating getting slow on sales screen