Imported additional code for Lab#5
Added required JAR-s from ./lib
Implemented code from HW#5 Task 1.
Slight change
Added endSession function.
Added functions for exiting program and disconnect from DB (not working
yet).
Added DB connection implication (NOT WORKING)
Implemented working SoldItem and StockItem link to DB.
Implemented warehouse update from DB.
Ending DB session now works.
Many changes.
Added new functions / methods to develop on.
Fixed price error (my fault).
Fixed bug - products list is now updated when starting new purchase.
Moved "model" package to "domain" package, which is more logical.
Added 8 stockitems.
Deleted unnecessary line from db.script.
Added all stockitems.
DomainControllerImpl now deals with data movement.
Changed domain controller to DomainControllerImpl, removed dbservice as
it is in the domain controller.