update

create new method in datetime_to_sql_format and update my_outlays and
dbhensdler methods
Merge branch 'master' of https://github.com/Oksana-Ivanova/Cost_manager_desktop

Conflicts:
	Desktop/Desktop/My_outlays.Designer.cs
	Desktop/Desktop/My_outlays.cs
	Desktop/Desktop/New_Category_Form.Designer.cs
	Desktop/Desktop/New_Category_Form.cs
	Desktop/Desktop/bin/Debug/Desktop.exe
	Desktop/Desktop/bin/Debug/Desktop.pdb
	Desktop/Desktop/obj/Debug/Desktop.csproj.GenerateResource.Cache
	Desktop/Desktop/obj/Debug/Desktop.exe
	Desktop/Desktop/obj/Debug/Desktop.pdb