import of merchandise related classes from devel branch
Imported MerchandiseList from devel branch
Changes in MainWindow mostly pulled from devel branch
Removal of *Towar* classes obsolete with Merchandise* classes
missing calendar icon
cleanups in MainWindow
temporary (or not) fixes for working with current mysql database
make marchendise list not greyed in merchandise search
handle changing merchandise count to 0
Loading saved offer and prnting
clearing before loading new offer, fetch more (needed?)
Lots of cleenups and refactoring. Now able to get users list as normal user
Merge branch 'database' into newBuild

Conflicts:
	Database.cpp
	Logowanie.cpp
Merge branch 'Merchandise' into newBuild
cUser -> User
Reimplemented saving offers merchandise to database
Removed unused 2 old insrt into db functions
Fixed loading offer