This helps to avoid a nasty hack with loading inner Kotlin classes in JDR,
which makes it a bit easier to 'lazify' JDR, since now the container of a
Kotlin class is no longer required to be resolved eagerly before resolution of
the class itself
Add sources and instructions to tests which had compiled jars in the testData.
PLEASE ALWAYS ADD SOURCES for tests with jars.
Delete runtime, stdlib and their sources from these jars -- PLEASE DO NOT PUT
kotlin-runtime.jar INTO TEST DATA JARS: every such jar is around 1Mb, it spoils
the repository
