Plugin configuration values are not stored for a job

[Nicklas Nordborg]

Consider the following case:

A user selects a plugin and configuration and creates a job, for example, for importing data. While the job is waiting in the job queue, an administrator changes to configuration. For example, the regular expressions used to parse a file. Now, when the job starts to execute it is possible that the selected file no longer can be parsed by the plugin and the import fails.

Another case is that you have done some analysis of data with certain configuration values. If the configuration is changed it may be that the analysed data no longer makes sense, but there is no way to tell what the original configuration values were.

The first case is annoying, but the second case could certainly be a major issue which may lead people to not trust data analysed by Base in all cases.

[Nicklas Nordborg]

(In [2709]) Fixes #318: Plugin configuration values are not stored for a job

And updated some documentation as well.