Added subscription addresse switching (by Abhilash Raj). ...

Some modifications on summary view/html markup and wording.

* Added subscription moderation. ...

* Subscription attempts now show proper messages (subscribed/held for approval).
* Style changes on most forms.
* Removed some cruft from the forms module.
* Style changes on the summary page.
* Added list owner address to summary page.
* Added a note for moderators about non-advertised lists to the list index to avoid confusion.

rerecorded http test files

completed tests for list subscriptions: ...

- open list sub goes right through and adds a member.
    - moderated list sub is held for approval.

List subscription: Added proper feedback message, depending on immediate subscription or approval needed.

changed request identifier from request_id to token

renamed dev envs in tox.ini

rerecorded test files

added test for list subscriptions

local tox settings

Merging Ashish's code for convenient CSV export of the members list

Merge

Changed (and i18n'd) footnote on non-advertised mailing lists.

Fixed deprecated import

Merging Aurélien Bompard's most excellent one-character patch for unicode

Pep8 + Owner check

add pre_verified/pre_confirmed flags to subcription call if: ...

- user is logged in and subscribes to a list
- an admin mass subscribes a user

allow non-integer request ids in url

replaced legacy settings form

- form styles: larger text boxes ...

- new list identity and auto response forms

rebased trunk

Removed option for email verification on mass subscription. This is going to be added in another release.

Removed option for email verification on mass subscription. This is going to be added to another relase.

Add an error message if subscription moderation fails

Merging Sumana Harihareswara's fix for the inaccurate held message docstring

added tests for change subscription

merge trunk

Fixes #1444721

list owner required for mass removal (as opposed to a list moderator)

- added url/view for request handling (draft) ...

- use the correct list section string if none is specified