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Use --filter-by to filter by owner and name.

Refs #5014

Introduce field `uuid'; use it to refer to projects in the API and the
management commands.

Cleanup project status description in management command project-list.

Applications now point to a project (rather than an extra model Chain).
A Project is created upon submitting an application; it always points to
a single `reference' application.

Model Chain is kept as a sequence to generate project ids.

Commit 7cfc0ce moved code from webproject to snf_django. This commit
fixes some stale imports that skipped renaming.

snf-webproject contained the generic ListCommand, and because of this it
had a dependency from snf-django-lib. This commit moves this command from
snf-webproject to snf-django-lib and removes this dependency. Also,
updates all imports of ListCommand.

Refs #4041

Use a custom way to retrieve and filter project data; ListCommand is
not suitable when multiple tables must be consulted.

Refs: #3346

* Change `synnefo.webproject.management.commands.ListCommand`
to permit post database selection filtering
and pass the command options to the 
handle_db_objects()
* Change project-list command to inherit
`synnefo.webproject.management.commands.ListCommand`
* move callable functions outside the ListCommand
classes

An admin can modify a project, i.e. create an application based on
a previous application. We distinguish the initial applicant, called
the `owner', from the user who submitted the current application,
called the `applicant'.

Show owner instead of applicant in project-list: the applicant can
vary among applications for a single project, but owner is likely
to be unique.

to better expose a pending application

Note that select_related() does not automatically bring
`related_name's, such as ProjectApplication.project.
Need to specify select_related('project'), which brings
`project' (but not `owner', or other related field).

Change Project's state field and ProjectMembershipHistory's person field;
replace all migrations starting 0015 with a single new one.

Need to check for missing data migrations.