[geary] (7 commits) Non-fast-forward update to branch wip/181-special-folder-dupes

[Michael Gratton <mjog src gnome org>]

The branch 'wip/181-special-folder-dupes' 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:

  960ed19... Convert Geary.FolderRoot to be an actual root, not just a t
  5e6ecb8... fixup
  308cb4c... Add additional FolderPath unit tests
  1949fcd... Revamp Geary.FolderPath implementation
  fcb6e5f... Fix pathological FolderPath.is_equal() case, add unit test
  c0faf9e... Fix ambiguous test in AccountInformation.set_special_folder
  92b851a... Add some useful debugging to GenericAcount
  7e1b946... Rework GenericAccount::ensure_special_folder_asyc yet again

Commits added to the branch:

  5a22e8e... Convert Geary.FolderRoot to be an actual root, not just a t
  423a1dc... Add additional FolderPath unit tests
  ddbe6e0... Revamp Geary.FolderPath implementation
  e1fd9da... Fix pathological FolderPath.is_equal() case, add unit test
  1ed0f5a... Fix ambiguous test in AccountInformation.set_special_folder
  b1461d8... Add some useful debugging to GenericAcount
  bb0060b... Rework GenericAccount::ensure_special_folder_asyc yet again