add startup window
add basic invoice view
add invoice creation dialog
add methods to access data from QDialog window
add basic view for magazine module
add basic view for contractor and individual client
add basic logic to add contractor and client
merge with feature-basicView
add basic logic to invoice module
add basic logic for magazine module
fixed invoice add
various fixes
add c11 support
add saving invoices to file
import invoice from file
further changes
fixed passing variables higher to parent window
add slot and signal mechanism to all modules
add basic edit
add basic invoice functionality