* Added a new account key called type for server accounts

* Added a new account key called type for server accounts
* Added "data_changed" signal to the store widget
* Added username entry to the transport widget
* Added _get_requires_auth method to the transport widget
* Added support to check completeness of some pages in the account assistant
* The transport account is now created with the account assistant
* The account manager now stores the type configuration key for server accounts
* Updated the platform factory to the new tinymail API (added 3 new methods)
* Replaced camel calls by the new platform factory calls in ModestFormatter &
ModestMailOperation
* Added ModestProto to the Makefiles

pmo-trunk-r580