this was violating thread safety of accessors, since the mainLoopWrapper() was reading initial values at the same time as the test thread was reading the same accessors.

solved a race condition in testTrigger. Initial value was not considered. Still race conditions remaining.

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