Files should be annotatable

[Nicklas Nordborg]

It could be useful to store metadata about files as annotations.

[Nicklas Nordborg]

In 7856:

References #2224: Files should be annotatable

Core- and data-layer classes have been updated so that file support annotations. Database schema version updated to 149.

[Nicklas Nordborg]

In 7857:

References #2224: Files should be annotatable

Added support for annotations to file list, view and edit pages.

[Nicklas Nordborg]

In 7858:

References #2224: Files should be annotatable

Annotation importer should use PATH instead of NAME when referencing files.

[Nicklas Nordborg]

In 7859:

References #2224: Files should be annotatable

Updated the "Item overview" functionality to include annotations for file items. File items are either included as "data files" or as the the target in any-to-any links.

[Nicklas Nordborg]

In 7860:

References #2224: Files should be annotatable

Annotation validation in the "Item overview" failed for any-to-any items (and probably also file set items) since we need to use the target item to get to the annotations.

[Nicklas Nordborg]

In 7861:

References #2224: Files should be annotatable

Adding file loading from protocol nodes and validation to the "Item overview".

[Nicklas Nordborg]

In 7865:

References #2224: Files should be annotatable

Need to ignore missing files when testing the "Item overview" since we never set files for protocols.