Optimise work

See merge request !135

Upgrade Django

See merge request !134

Allow multiple terms to be separated by comma

See merge request !133

Up to now, including multiple terms on a single row of a spreadsheet
would only create one term. This change makes the importer recognise a
comma as a separator for multiple terms.

Fix items missing from filter dropdowns

See merge request !132

Restore sorting arrows

See merge request !131

Improve table performance by paginating the API results

See merge request !129

TODO: Reinstate the arrows in the table headers to indicate sort direction

Upgrade Django to 1.11.22

See merge request !127

Fix CSV export to include tags

See merge request !125

Was using 'long_name' instead of 'name'. Tags don't get long_name set through the
tagging UI.

Pylava fix

See merge request !123

Add external ID to feedback export

See merge request !122

Add profiling tools

See merge request !121

Filters now wrap  on to multiple lines

See merge request !119

Note this is only done at the form level. We aren't enforcing this at the database level.
In fact I don't think the REST API currently does any permission checking.

Import kobo uuid

See merge request !118