Squad

* frontend: migrate all templates to Jinja2
* core:
* fix incorrect notification template names
* comparison: compose results from a single database lookup

* Backport fixes from master branch:
* frontend: fix pagination iterator variable
* celery: really set celery to log with the same settings as the main app
* celery: workaround missing attribute in billiard frame objects

* Add infrastructure for counting database queries
* squad.manage: check performance counts when running tests
* api:
* add advanced filtering backend
* add suitemetadata endpoint
* add support for listing suite/test names in project
* `test.api.test_rest`: add extra test data
* core: TestComparison: optimize database access
* frontend:
* Add indicator when adding/updating tests.
* fixes to compare.js and compare.html
* fix test history table for Chrome
* Fix `test_run`'s `job_id` on build page
* limit testjob/<id> urls to support only integers
* replace comparetest combos with select2
* Move chart.js bundle script from base template to metrics.
* charts: Remove x-axis ticks in case of an empty result set.

* core: NotificationDelivery: allow new notifications on changes
* core: TestComparison: fix performance regression handling xfail

* scripts/release: don't distribute `local_settings.py`

The previous release erroneously included a local configuration file, and has
been removed from PyPI. This release fixes that mistake, and supercedes the
previous.

* core:
* Make order of tests important in notifications
* notifications: avoid duplicated "X FAILED TEST JOBS" notifications
* queries: use build date for X axis
* queries: also count xfail when calculating test pass %
* queries: fix Test pass % in the presence of multiple test runs
* TestComparison: record xfail -> pass transitions as fixes
* frontend:
* build page: visually indicate that "more info" is available
* improve presentation of known issues in the UI
* display reason for build being unfinished
* create separate view for full metadata
* Make it possible to display the charts page in fullscreen
* test history: add links to group and project
* api:
* allow to filter ProjectStatus by `last_updated` field
* add 'comparetest' to the api UI header
* provide metrics data in CSV as well
* Limit number of points in charts
* fix pagination in TestRun detail routes