Using standard subplugin support, this commits implements
the restore of logstore subplugins in general and the
standard logstore is particular. Notes:
- TODO: Decide about these 2 pending issues:
1) Some logs are already created (events fired) by the restore process itself. Every time
an API is used and it fires events... corresponding (and actual!)
logs are created. We need to prevent restore to duplicate them (or,
alternatively, stop firing events when restore is happening).
2) There are 2 pieces of information in the logs that, right now, can
not be restored, because the process does not know enough to be able
to remap that information to its new counterparts. We are talking
about objectid and other columns. So we need to specify, in some way
understandable by restore, to which existing mappings they correspond
to.
It was using select menus for the convenience of the code, but the
inconvenience of users.
The way this fix is done is a bit hacky, but it works, makes users'
lives much better, but it would be good if someone would dehackify
this in the future.
