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kotlinlang

<@U092N7GGG> After reading documentation finally decided that there is problem in `org.jetbrains.kotlin.idea.quickfix.AbstractQuickFixMultiFileTest#doMultiFileTest`, and it not possible with multifile tests ever,
may be I should add support for it?
As I think it will be useful to add following ability
```
// FILE foo/Bar.java

package foo;
public class Bar {
}
```
Where part before last '/' will be used as location in source root
So VFS will be
```
someTempDir(sources root)
  - foo
    - Bar.java
```

Instead of now 
```
someTempDir(sources root)
  - tempFile.java
```