Reorder accounts by drag-and-drop.
This implements https://bugzilla.gnome.org/show_bug.cgi?id=663527#c3. Account reordering is now done by drag-and-drop instead of up/down buttons. Turned out to be a wee bit more complicated than I initially thought. This scraps EAccountManager and EAccountTreeView and replaces them with new classes centered around EMailAccountStore, which EMailSession owns. EMailAccountStore is the model behind the account list in Preferences. The folder tree model now uses it to sort its own top-level rows using gtk_tree_path_compare(). It also broadcasts account operations through signals so we don't have to rely so heavily on EAccountList signals, since EAccountList is going away soon. Also as part of this work, the e-mail-local.h and e-mail-store.h APIs have been merged into EMailSession and MailFolderCache.
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