Changes inside tableView Controller

New xib for cell added. The cell Nib is registered in calculationTable lazy instantiation. Several private properties renamed.
Some graphic for section headers added

Section header drawrect() overloaded
Cell class added. Cell Nib deleted.
Storyboard modified

UIViewControllers of three screens changed to UITableViewControllers. SHMCalculationScreenViewController is no longer needed
multiple changes in Tableview controller and SectionView

1) The information about which sections are opened is now stored in SHMTableWithOpeningSectionsViewController in self.openedSectionsArray. The bug with the need of double tapping on the section to open it is no longer exist because of that.
2) The debts data is now stored in self. debtsArray (NSArray) and to access the data by indexPath of a cell findDebtForIndexPath method should be used.
3) method receiveDictionaryFromCalculationModule is used to emulate data receive from calculationModule. Update this method to receive data.
4) small changes in SectionView and TableViewController to work with 1,2,3
_namesOfPeopleArray deleted

this property is no longer needed. Use [self.listOfDebts allKeys] to get it [4980878]