Prints a clear message if a circular dependency of initial values exists.

Poll-type reads are blocking until the initial values are available, hence the testable mode must be released in case the initial value is not yet available.

Create unique temporary directories.

	calling device.getOneDRegisterAccessor<double> causses an error in server,
	when having uder type string

exception handling spec: swap C.3.3.7 and C.3.3.8

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

fix tsan complaining about incrementing/decrementing testableMode_deviceInitialisationCounter outside testable mode

The previous order was causing actual race conditions, see #173.