Handle XP Dump Archive

[GlennRicaud]

Handle 7.3 dump archives:

Valid XP dump archive:

1. File name MUST finish with ".zip"
2. MUST contain an entry

• "dump.json"
• OR archiveName + "/dump.json"
• OR "^([^/]+)/dump.json$"

3. Does not handle multiple dumps
   DT dump archive:
   Archive / No restrictions (May contains multiple dump directories).
   Its content is simply unarchived into data/dump directory

Check for XP dump archive:
1) File finishing in ".zip"
2) Contains exactly 1 entry "^[^/]+/dump.json$"
=> Would require too much time to go through the entire archive

Decision:

• Do not support "DT dump archive" anymore. Consider all dump archives to be XP dump archives.
• Do not allow to download multiple dumps.
  If a DT dump archive is uploaded, it will work. If it contains multiple dumps only one will be taken into consideration.