Module s.g.e.tilleditor

Editors implementation for open/close operation on till operation

Class	_TillOpeningModel	Undocumented
Class	_TillClosingModel	Undocumented
Class	_BaseCashModel	Undocumented
Class	TillOpeningEditor	An editor to open a till.
Class	TillClosingEditor	No class docstring; 1/9 methods documented
Class	BaseCashSlave	A slave representing two fields, which is used by Cash editors:
Class	RemoveCashSlave	Undocumented
Class	CashAdvanceEditor	An editor which extends BaseCashSlave to include.
Class	CashOutEditor	An editor to Remove cash from the Till
Class	CashInEditor	An editor to Add cash to the Till