This is changed behaviour introduced with c9948142

Before it had to be stripped for all use cases anyway, so it is better to leave it out from the beginning.

For some reason this was disallowed and even tested to throw.

This actually makes the implementation also easier and more efficient.

* add HierarchyModifyingGroup

* VirtualModule: allow nested oneLevelUp etc.; simplify implementation

This is achieved by properly setting the _owner of each VirtualModule (unless highest level).

The simplification comes from then being able to use getOwner() instead of keeping track of "grandparents", and from using createAndGetSubmodule() instead of implementing something similar again in findTagAndAppendToModule().

* DataLossCounter constructor now takes qualified path to trigger variable

Co-authored-by: Jens Georg <jens.georg@desy.de>

Forgot to adpopt test to the new method signature.

* Fix initial msg. Add automatic connection to the LoggingModule.

Now the Logger is a VariableGroup and in the prepare() method an empty
msg is written once. This makes sure the LoggingModule is not waiting
for initial values of Loggers and messages by other Loggers get lost.

* Add message in case on modules with Logger are found.

* Fix test and remove implementation of removed method.

* Do not use hard coded tags but use default tags.

Now all tags given to the LoggingModule are used to look for senders.

finally managed to cook up a test that is sensitive to the connection errors when using hierarchy modifiers

This closes #29.

Manual check to be used temporarily.

These additions cover the behavior described in #29.

  - Rename, this does not test the intial value propagation
  - Remove debug output

It was agreed to never do this. What strings are for display only and should not be analysed, neither by tests nor by applications.

- All modules have names
- "DEVICE" tag removed because it is not used any more

Create unique temporary directories.

testDeviceInitialisationHandler: convert globals used by different threads into atomics to avoid data races (tsan was complaining)