add readOnle property for steelGrade
Merge branch 'sidorov_MillViewModelRepo' into sidorov_ReadOnlyFix

Conflicts:
	src/PrizmMainProject/Properties/licenses.licx
fix according to issues:
 grid at "Find pipes" is editable #212
 At new pipe: shipping date has value (shouldn't) #215
Merge pull request #231 from olga-jane/sidorov_ReadOnlyFix

Sidorov read only fix