Ubuntu: rename to trojita-ubu

This is done in order to prevent filesystem clashes between the Ubuntu-branded
and the common desktop version.

BUG: 333073
REVIEW: 117418
Ubuntu: Fix not finding main.qml causing core dump

the qml files were still being copied to share/trojita and not share/

BUG: 333153
REVIEW:117419
Ubuntu: Enable viewing mailbox subdirectories

Mailbox view can now navigate through child mailboxes.

REVIEW: 117382
BUG: 332989

Fixed translation of Total & Unread message counts

Icon is copied from the ubuntu-mobile-icons package available from
http://packages.ubuntu.com/trusty/all/ubuntu-mobile-icons/download
and is available under the CC-BY-SA 3.0. Copyright by 2004-2012, Canonical Ltd.
Merge remote-tracking branch 'dpniel/mail_box'
Ubuntu messageListPage suppress error message caused by model being null

REVIEW: 117308
Ubuntu: support RoleMessageHasAttachments returning null QVariants

This fixes a nice QML warning "Unable to assign [undefined] to bool".
SVN_SILENT made messages (.desktop file)
Ubuntu: Fix password dialog

Password dialog now uses a composer sheet, which also displays any
authentication errors
raised.

When launching app, if an imap account already exists then we skip the
settings page and
go straight to mailbox view where the password dialog will open
requesting password.

If an authentication error is raised we show an additional message that
explains to
either retry entering password or click cancel to return to the settings
page. We do not want the
user to be able to view mailbox without a connection. So this message
tries to make it clear what
clicking Cancel will do

REVIEW: 117380