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Merge commit '1851c86c' , which is a conflict-free version of RC1. The last remaining commit will be merged after this merge commit, so the conflict is easier to resolve

- use DummyRegister::getRawAccessor for access to backend registers.
- read and write convenience methods for rawAccessor.

Introduced UpdateModule which provides a Process Variable connected to
ExceptionDummy register  "REG1"

- runtimeErrorHandling_testPushTypeReadNonBlocking

- Reworked header.

- Reworked header.

- Reworked Header.
- Revised variable name. version -> versionBeforeRuntimeError

- Reworked header.

- Version number in exception case is always the same.
- Remembers that it has reported an exception so a readLatest() after recovery does not switch the data validity back to ok if there was no new data.

- All variables conceptually have an initial value now.
- All initial values read by blocking read() before starting the main loop.
- More tests failing, probably to old test exceptiations and wrong test implementations.

- tests still failing
- modifications incomplete
- cleanup needed

- Initial values are sometimetimes only propagated in the first run of the main loops, not in prepare. If other modules are waiting for it they cannot enter their main loop. That's why all threads have to be started first, and only the it is waited for all of them to enter testable mode.