Fix the old migration 0038_set_country_for_aspirant_presidents

In South datamigrations you have to refer to models with
orm.ParticularModel instead of just ParticularModel, so that
the frozen version of the model is used instead.  This wasn't
a problem when this migration was run, but may be in the
future if the models that it refers to change.
Fix the old migration 0037_migrate_data_for_parliamentary_sessions

South datamigrations have to use the frozen models via the orm
parameter in the forwards and backwards migrations.  When doing
the migration in an admin command, this wasn't the case - it
was importing whatever the models were in the current models.py.
Instead, remove the admin command and use the code in the
datamigration itself, referring to the models via the orm
object.
Added clear fix to .page-wrapper

fixes #574
Update test fixtures for the other_names => AlternativePersonName change
Update the autocomplete test to ignore the <img> now also returned
Add in .clearfix to css (should it be coming from compass?) - part of #574
Correct the --omit parameter for coverage.py

Despite what some things on the web suggest, you seem to need
to have a wildcard at the end of a path in the --omit list.
Fix mapit 404 being shown issue.

* Move 404 template into country apps
* load country app before mapit

Stems from commit 09640b660c38bcaf286b827c37dffb9f815e38c4 I suspect

Closes #576
Create a new app just to hold changes to the admin. Move admin template overrides into it. Closes #579
Add alternative names back to the admin interface
Don't link to CSS file that has been removed
Show notices on the homepage (closes #533 - again)
Add some calls to action. Part of #573 but leaving open as they are not very good.
Drop unused comments CSS
Add help line to comments about sorting (C'mon disqus, just get it working).

closes #463 (again)
Make the clearfix CSS class name consistent. Closes #574
Merge branch 'evdb-dev'
Make get_aspirants return None if no aspirants are found
Don't traverse up places through different parliamentary sessions

Place.get_candidates recurses up through the Place's parent
attribute to return candidates for enclosing areas.  However,
we have the slightly odd situation in Kenya where old
consituencies still have the new counties as parents, so
county+above level aspirants are still shown for old
constituencies.  This is confusing, so stop the recursion
up through the Place hierarchy if it would go from one
parliamentary session to a non-overlapping one.
Display a helpful message in place of aspirants on old constituencies

If no aspirants are found for a constituency, and this
constituency is for a past parliamentary session, we now
point this out, and provide links to the constituencies
that places that replaced this one.