daemon: Remove not used method in DataStorage
daemon: Move remove/store into sub-routines of SimpleBundleStore
daemon: Implement getDistinctDestinations() in SimpleBundleStorage
daemon: Fix erase before reporting issue in MemoryBundleStorage
daemon: Free storage space again if a bundle duplicate was detected
Revert "daemon: Remove not used method in DataStorage"

The method is used in the testsuite.

This reverts commit 445295b50b3b21fd566ad21029b268150d4fa2a7.
daemon: Fix recent introduced bug in SimpleBundleStoreage::clear()