Changed product management to Topi's version.
autocompleter sales.cpp tiedostoon
Merge remote-tracking branch 'topi/master'
Added product add functionality.
product luokka laitettu alulle
Merge remote-tracking branch 'pekka/master'

Conflicts:
	ui/mainwindow.cpp
Fixed merge.
Removed double entry for loginpage.ui.
Fiksausta
Merge remote-tracking branch 'topi/master'
Barcode checker added

Lisätty barcode checker product luokkaan.