Move, Copy and/or Synchronize Parts or all of Trac Instance

There are some use cases where moving, copying, synchronizing trac instances (or part of trac instances) might be benefitial:

• single persons working disconnected:
  • they would need to get the latest information they have access right to onto a laptop.
  • when reconnecting to the network they need to merge their changes into the central trac instance
• InterTrac:
  • information is entered into the wrong instance and should be moved to another one.
  • information should be moved to a newly created trac instance

related tickets are: #1465, #1465

some solution ideas grabbed from the mailing list and the tickets

• use import/export with csv ie ​csv2trac.py
• use (implement) versioning backenends as trac storage backend
• use (implement) synchronisation based on the xml-rpc based on timeline information

challenges which may come up

• stable ticket numbering must be guaranteed (either provide prefixes or numbering ranges for the instance which created it or invent something else)
• in the intertrac configuration, there might be links on a moved object. these links would have to be changed. is there any "backlink" or "where did it get used" in trac to find this information?
• different trac instances might have different ticket fields and field contents, i.e. administrative settings. but ​EmailtoTracScript also has this problem, and it anyway works.