initial work for delegate for editing operations; JobshopModel bound to tableView
removed old externs
jobshopModel: implemented data() and revised operations count
MainWindow: some refactoring, not disabling operations count and more button
Job:
* some refactoring
* added getters and setters for each parameter
* initializing beta and alpha to 0 in default contructyor
* returning operation for Data() whe EditRole
* setter for operation - not finished
OperationWidget:
* some refactoring
* now holding operation as property
* getter and setter for operation - not finished
* geter and seter for machine and time - not finished
Operation:
* now not holding pointer to job
* unique id
* getters and setters for properties
* new format for printing