Updated table adapters to keep track of changes into the StockHistory table
Merge branch 'database' into stock
Added login module for accessing the database
Forced user login at startup
Encapsulated logged user data and made everything to be automated
Finished updating the StockManager with the rest of the changes
Refactored code and added an entity wrapper for products
Added measurement unit field to the product wrapper class
Added field clearing method for the product entity
Refactored the StockManager to use the product entity wrapper