Merge pull request #3951 from ckamm/checksum

Checksums stored in database #3735

diff --cc src/libsync/owncloudpropagator.cpp
Simple merge

diff --cc src/libsync/propagatedownload.cpp
Simple merge

diff --cc src/libsync/propagateupload.cpp
Simple merge

diff --cc src/libsync/syncengine.cpp
Simple merge

diff --cc src/libsync/syncfileitem.h
Simple merge

diff --cc src/libsync/syncjournalfilerecord.cpp
Simple merge