* more changes to the account management; now the following should work again:

* more changes to the account management; now the following should work again:
  - changing account names (updates modest-account-view, and modest-folder-view)
  - expand root folders
  - change modest-account-mgr to only emit change signals once per 500ms
  - modest-account-mgr changes notification now only give the "parent account",
    not the server account, and not for every single key
  - accounts are changed, not recreated

pmo-trunk-r2888