Add subtype and node columns to job item

[Nicklas Nordborg]

The subtype column is a link to ItemSubtype and should be used for easier filtering of the OTHER type jobs that are not linked to a plug-in.

The node column is an text optional text column that can be used together with the server column to further specify the computer that executes a job. For example, the server is typically set to the controller node in cluster (Open Grid cluster) and the node can then be set to the actual node that does the job.

[Nicklas Nordborg]

(In [7264]) References #2050: Add subtype and node columns to job item

Added the node column. The update script will extract the part within [...] on existing jobs and move to the node column.

[Nicklas Nordborg]

(In [7265]) References #2050: Add subtype and node columns to job item

Added node to list view, job dialog and a few other places which display the server.

[Nicklas Nordborg]

(In [7266]) References #2050: Add subtype and node columns to job item

Added the subtype column.

[Nicklas Nordborg]

(In [7267]) References #2050: Add subtype and node columns to job item

Display the subtype column in the list view and in the job dialog.

[Nicklas Nordborg]

(In [7286]) References #2050: Add subtype and node columns to job item

The filter for subtype column in the list view should have a 'none' option.