deep_copy has a different default value for AcquisitionData and ImageData

[hrobarts]

Description

In the AcquisitionData class deep_copy is True by default but in ImageData it's False. Maybe we should remove the default because it's confusing to have opposite defaults and deep_copy should always be selected carefully.

Environment

import cil, sys
print(cil.version.version, cil.version.commit_hash, sys.version, sys.platform)