testAppModuleConnections uses BOOST_CHECK_EUQAL instead of BOOST_CHECK at some places for easier debugging

fix: TestableModeAccessorDecorator::preRead() always released the lock and did not delegate the call to the target

ConstantAccessor not pushes the value to the queue yet

In terminate(), call interrupt only when wait_for_new_data is set

Wip/phako/spec comments

This partly reverts d5ab1447, where the existing doReadTransfer overrides
were removed. This commit gets the existing implmentations back, but
changes the function name to doReadTransferSynchronously.

Remove functions that do not exist anymore

ExceptionHandling spec: explicitly mention what returns true/false means (hasNewData or dataLost) each time