Compile library dependencies in the test instead of storing them as jars in the
repository. Reuse MockLibraryUtil, move it from idea tests to compiler-tests
Package fragment classes now are named "*Package-<filename>-<hash>" instead of
"*Package$src$<filename>$<hash>". This will help to avoid erroneous code in
intellij FileManager, which assumes that classes with dollars are always inner
classes of some other class (see AnnotationDescriptorDeserializer)
