add disabling of superuser deactivation,
propose to enter new password if expired
add out of range check
Merge branch 'master' into sidorov_Superuser#643

Conflicts:
	src/PrizmMainProject/Program.cs
change public static to private const
rewrite namespace PrizmMain to Prizm.Main
Merge branch 'master' into sidorov_Superuser#643

Conflicts:
	src/PrizmMainProject/Forms/Settings/SettingsXtraForm.cs
Merge pull request #652 from olga-jane/sidorov_Superuser#643

add disabling of superuser deactivation