[balsa] (20 commits) Non-fast-forward update to branch popover

[Peter Bloomfield <peterb src gnome org>]

The branch 'popover' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  510ac2d... pref-manager: Use GtkPopover for "Add" options
  fb56877... vfs: Port to GMenu
  d062037... libbalsa-vfs: New API to use with GMenu
  d00c2d1... various: Port to new LibBalsaVfs API
  c37b7e4... body: Add a gpointer user_data member
  c07f896... mblist: Port the MRU menu to GMenu
  518ae91... Various: Adapt to MRU menu changes
  67a48fe... compose window: Break the attachment context menu
  fc26199... balsa-index: Port context menu to GtkPopover
  3e62988... compose window: Improve popover placement
  075a166... Bump Gtk requirement to 3.22
  aca774b... balsa-index: Improve context menu placement
  acf93bf... compose window: Improve context menu placement
  47c4610... balsa-message: Improve the GtkPopover popup
  ab8b919... compose window: Pop up the menu at the pointer
  8f7ebc2... balsa-message: Port another popup to GtkPopover
  66b0844... balsa-message: Port the parts-menu to GtkPopover
  4afb835... balsa-index, balsa-message: Check GdkEvent

Commits added to the branch:

  3b3320c... compose window: Improve the popup context menu (*)
  b50fe0e... Release balsa-2.6.1 (*)
  41bb6e5... pref-manager: Use GtkPopover for "Add" options
  e03e366... vfs: Port to GMenu
  744a310... libbalsa-vfs: New API to use with GMenu
  d75335a... various: Port to new LibBalsaVfs API
  ea8ddcf... body: Add a gpointer user_data member
  d1949e0... mblist: Port the MRU menu to GMenu
  1e3a7af... Various: Adapt to MRU menu changes
  d9aa2cf... compose window: Break the attachment context menu
  3bacd30... balsa-index: Port context menu to GtkPopover
  bc4ab5c... compose window: Improve popover placement
  7856695... Bump Gtk requirement to 3.22
  e6b6656... balsa-index: Improve context menu placement
  3a41bc8... compose window: Improve context menu placement
  6fe1d1c... balsa-message: Improve the GtkPopover popup
  94b3611... compose window: Pop up the menu at the pointer
  0b38e18... balsa-message: Port another popup to GtkPopover
  7b74e24... balsa-message: Port the parts-menu to GtkPopover
  daca149... balsa-index, balsa-message: Check GdkEvent

(*) This commit already existed in another branch; no separate mail sent