Merge lp://staging/~abentley/launchpad/js-usage into lp://staging/launchpad

Allow inline editing of translation settings.

= Summary =
Ajaxify setting translation usage.

== Proposed fix ==
Since the form used for updating translations is complicated, submit the form
to the appserver instead of using the web service.

== Pre-implementation notes ==
Discussed with deryck.

== Implementation details ==

Extracted update_form from replace_productseries.
Extracted form_url from replace_productseries.

Implemented usage_overlay.

Implemented submit_form to submit the form data from the usage overlay.

Implemented FormErrorHandler as a subclass of ErrorHandler to handle web page
form submission errors instead of web service errors.

Allow error handler to be specified for IOHandler.

Update tests to use the *visible* overlay, not the first overlay.

== Tests ==
bin/test --layer=WindmillLayer sharing_details
firefox lib/lp/translations/javascript/tests/test_sourcepackage_sharing_details.html

== Demo and Q/A ==
Go to a +sharing-details page and click the edit icon next to "Translations
(are/are not) enabled on the upstream project."

A green checkmark should be shown when "Type of service for translations
application" is "External" or"Launchpad". The other values should be settable,
but have no impact on the main page.

= Launchpad lint =

Checking for conflicts and issues in changed files.

Linting changed files:
  lib/lp/testing/windmill/widgets.py
  lib/lp/app/javascript/lp.js
  lib/lp/translations/templates/sourcepackage-sharing-details.pt
  lib/lp/app/javascript/client.js
  lib/lp/translations/javascript/tests/test_sourcepackage_sharing_details.js
  lib/lp/app/javascript/picker.js
  lib/lp/translations/browser/tests/test_sharing_details.py
  lib/lp/translations/windmill/tests/test_sourcepackage_sharing_details.py
  lib/lp/translations/javascript/sourcepackage_sharing_details.js
  lib/lp/translations/javascript/tests/test_sourcepackage_sharing_details.html
  lib/lp/translations/browser/sourcepackage.py

./lib/lp/testing/windmill/widgets.py
      29: E501 line too long (80 characters)
      35: E501 line too long (80 characters)
      36: E501 line too long (81 characters)
      95: E501 line too long (83 characters)
     122: E301 expected 1 blank line, found 0
      27: Line exceeds 78 characters.
      29: Line exceeds 78 characters.
      35: Line exceeds 78 characters.
      36: Line exceeds 78 characters.
      43: Line exceeds 78 characters.
      95: Line exceeds 78 characters.
./lib/lp/app/javascript/lp.js
      53: Expected '!==' and instead saw '!='.
     117: Expected '!==' and instead saw '!='.
     187: Expected '===' and instead saw '=='.
     290: Expected '===' and instead saw '=='.
     305: Expected '===' and instead saw '=='.
     306: Expected '===' and instead saw '=='.
     338: Move 'var' declarations to the top of the function.
     338: Stopping. (76% scanned).
       0: JSLINT had a fatal error.
./lib/lp/app/javascript/client.js
      30: Expected '===' and instead saw '=='.
      33: Expected '===' and instead saw '=='.
      54: Move 'var' declarations to the top of the function.
      54: Stopping. (5% scanned).
       0: JSLINT had a fatal error.
       4: Line exceeds 78 characters.
     191: Line exceeds 78 characters.
     570: Line exceeds 78 characters.
     618: Line exceeds 78 characters.
     745: Line exceeds 78 characters.
./lib/lp/app/javascript/picker.js
      43: Expected ';' and instead saw 'if'.
      92: Expected '!==' and instead saw '!='.
     223: Expected '!==' and instead saw '!='.
     224: Expected '{' and instead saw 'temp_spinner'.
     257: Expected '!==' and instead saw '!='.
     270: 'header' used out of scope.
     271: 'step_title' used out of scope.
     319: Move 'var' declarations to the top of the function.
     319: Stopping. (85% scanned).
       0: JSLINT had a fatal error.
     194: Line exceeds 78 characters.