Compatibility with YADE branches 1.x - AppendFiles=true

Current Situation

• When Profile/.../TargetFileOptions/AppendFiles=true
  1. If Profile/.../TargetFileOptions/DisableOverwriteFiles=true:
     • AppendFiles documentation excerpt:

       If AppendFiles is specified with the value true, then the parameter DisableOverwriteFiles will be ignored.

     • Behavior in YADE 1.x branches:
       • As described in the documentation, DisableOverwriteFiles=true is ignored.
       • This means that if the target file already exists, the source file is appended to the target file.
     • Behavior in YADE 2.x branches:
       • If the target file already exists, the transfer is logged with a "not_overwritten" state, and no source file is appended.
  2. When Profile/.../TransferOptions/Transactional=true or Profile/.../TargetFileOptions/Atomicity/AtomicSuffix | AtomicPrefix are set:
     • Behavior in YADE 1.x branches:
       • The transfer fails with an error message, e.g.:

         SOSVfs_E_0050: usage of option 'SOSBaseOptionsSuperClass.append_files' is in conflict with option(s) 'SOSBaseOptionsSuperClass.atomic_prefix=, SOSBaseOptionsSuperClass.atomic_suffix=~'.

• • • Behavior in YADE 2.x branches:
      • The transfer does not fail. If the target file already exists, it is overwritten by the current transfer.

Desired Behaviour

• The behaviour in YADE branches 2.x should be aligned with the behaviour of YADE branches 1.x.