A Document has its own snapshots set.
A snapshot is a string representation of a JSON object.
AdminModel keeps also the expired document objects.
Query each document object in order to get their own history.
Admin accepts an "history" command then returns a json object.
An administrator checks the history by dashboard.
Change-Id: I73c87eff334cdb5a4a58043b2b66f18a56240b3a
Reviewed-on: https://gerrit.libreoffice.org/35926
Reviewed-by: pranavk <pranavk@collabora.co.uk>
Tested-by: pranavk <pranavk@collabora.co.uk>
Top level make would now build loleaflet too if necessary.
Respect value of ENABLE_DEBUG and if present add debug-info to
generated js bundles too.
Add new rule, clean-local in loleaflet.
Change-Id: I3a9b727824f2877fc72719a8bfdeebed5448cb7d
