[balsa] (12 commits) Non-fast-forward update to branch stop-using-gtkbuttonbox

[Peter Bloomfield <peterb src gnome org>]

The branch 'stop-using-gtkbuttonbox' 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:

  090d038... libbalsa-misc: Install libbalsa_button_box_button
  1abcdcd... ab-main: Stop using GtkButtonBox
  f44914f... ab-window: Stop using GtkButtonBox
  239153e... balsa-mime-widget-crypto: Stop using GtkButtonBox
  cba87a0... mime-widget-message: Stop using GtkButtonBox
  300f760... mime-widget-vcalendar: Stop using GtkButtonBox
  662449b... libbalsa_button_box_button: Document a difference

Commits added to the branch:

  4016617... toolbar-prefs: Center the arrows vertically (*)
  a782ea6... libbalsa-misc: Install libbalsa_button_box_button
  066325e... ab-main: Stop using GtkButtonBox
  6e4e3f3... ab-window: Stop using GtkButtonBox
  fe0c67f... balsa-mime-widget-crypto: Stop using GtkButtonBox
  f60e488... mime-widget-message: Stop using GtkButtonBox
  a30aa84... mime-widget-vcalendar: Stop using GtkButtonBox
  522ed1e... libbalsa_button_box_button: Document a difference
  c464149... filter-edit-dialog: Stop using GtkButtonBox
  9028756... misc: Replace libbalsa_button_box_button()
  e819323... Various: Use libbalsa_add_button_to_box()
  ca382cd... main-window: Stop using GtkButtonBox

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