Dropping package facades:

- light classes: do not generate light class for package facade
- drop package facades as multifile classes compilation mode support
- get rid of some additional package facade fqName usages
- update tests for light classes

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JVMCompilerArguments.java

@@ -62,9 +62,6 @@ public class K2JVMCompilerArguments extends CommonCompilerArguments {
     @Argument(value = "Xno-optimize", description = "Disable optimizations")
     public boolean noOptimize;
 
-    @Argument(value = "Xmultifile-package-facades", description = "Compile package facade classes as multifile classes")
-    public boolean packageFacadesAsMultifileClasses;
-
     @Argument(value = "Xreport-perf", description = "Report detailed performance statistics")
     public boolean reportPerf;