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This introduces new requirements to the plugins.
1. If a plugin wants to be revertable it must implement the revert function.
This function will be accessible from the plugins top most namespace. The
same place where get_plugin is.
2. For the plugin's backend directory to be easily found, the plugin must
give the backend its module name as an id. In this way when the user
specifies in the revert command line plugin 'x', the revert class will
go to the backup directory in search for a directory called the same
way as the module of 'x'.
3. If the plugin developer does not want to use the system of backup dir
naming, there is a second way how to specify the backup dir. The
plugin must specify a function getBackupId(), that will return the id
of the backup space that can be used for the backup dir search.
Backup spaces that fail to comply with these directive will be ignored.
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