remove acquisition time from simple image mock factory
clear useless acquisition dates from examples
clear useless acquisition time from DB helper
clear useless acquisition times from test code
Merge remote-tracking branch 'remotes/origin/develop' into remove-useless-image-acquisition-times
remove additional image acquisition date from timeline test

suggested by @jburel
Merge pull request #2870 from mtbc/remove-useless-image-acquisition-times

Remove useless image acquisition times