Changes should address timing related failures in the tests.

Fixture teardown functions now ensure the device dummybackends do no
throw on read or write.

- Exception handling decorator does not allow to leave testable mode before
  devices are up
- Test facility makes sure that testable mode counter is zero at the end of startApplication()

activated tests for exception flag propagation with direct connection Device->ApplicationModule (part of #102)

All variables from the cs to device have been initialized with a non
zero default before the test starts.

- first part of #102
- Existing tests passing
- New tests not activated yet

Tests for Data invalidation propogation 

    - Basic structure of test application
    - Added modules
    - Refactoring of StatusMonitor to provide a non-templated base class
    - Needs follow-up, for status see issue #14 and the linked follow-up
      ticket

- testInvalidTrigger
- testDeviceReadFailure
- testreadDeviceWithTrigger
- testConsumingFanout
- testDataFlowOnDeviceException

- device1 -> device1DummyBackend.
- device2 -> device2DummyBackend.

Test application structure:

CS +---> threaded fanout +------------------+
             +                              v
             +--------+                   +Device1+
                      |                   |       |
                      v                +--+       |
  CS   <---------+ Module1 <-------+   v          |
              |       ^            +Consuming     |
              |       +---------+    fanout       |
              +----+            +      +          |
                   v         Device2   |          |
  CS   <---------+ Module2             |          |
                                       |          |
  CS   <-------------------------------+          |
                                                  |
                                                  |
  CS   <---------+ Trigger <----------------------+
                      ^
                      |
                      +
                      CS

Fix broken propagation of initial values