firt test D9 b for ThreadedFanOut

[wip #173] move clearing error status flag in control system after the point where operations are allowed again (fixes race condition)

A corresponding update of the specification will follow.

	Write tests for initial value initial value specification D.8

- Also removed race conditions in the test.

Spec data validity propagation v1.0 rc2

Print test name.

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

data validity propagation spec: Removed DataValidityCounter object, which simplifies the spec and the implementation.

- 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.