Code review comment for lp:~deryck/launchpad/sort-by-heat-as-default-77701

This branch changes the default sort on bug listings to be heat
descending rather than importance descending. As a consequence of the
change, it fixes bug 77701. Affected tests have been updated and
default sort is well tested.

Cheers,
deryck

= Launchpad lint =

Checking for conflicts. and issues in doctests and templates.
Running jslint, xmllint, pyflakes, and pylint.
Using normal rules.

Linting changed files:
  lib/lp/bugs/templates/bugtarget-macros-search.pt
  lib/lp/bugs/stories/bugtask-searches/xx-listing-basics.txt
  lib/lp/bugs/stories/bugs/xx-front-page-search.txt
  lib/lp/bugs/browser/bugtask.py
  lib/lp/bugs/stories/bugtask-searches/xx-sort-orders.txt
  lib/lp/bugs/browser/tests/bugtask-search-views.txt
  lib/lp/bugs/stories/bugtask-searches/xx-advanced-people-filters.txt