[devhelp] (18 commits) Non-fast-forward update to branch wip/swilmet/misc-improvements

[Sébastien Wilmet <swilmet src gnome org>]

The branch 'wip/swilmet/misc-improvements' 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:

  57b22ef... book-manager: fix fixme about decrementing language count
  1067fb5... book-manager: remove dead code
  c419ecf... book-manager: include only glib-object.h in the header
  e8eeaad... book-manager: avoid double negation
  3be9675... book-manager: better document instance variables
  8a153fc... Use G_SOURCE_REMOVE instead of FALSE in GSourceFuncs
  d12104c... Deprecate dh_book_manager_get_languages()
  4d67506... Remove some useless #includes
  13e5b52... book: better document instance variables
  252538e... book: deprecate unused comparison functions
  79312eb... book-manager: connect to DhBook signals with g_signal_conne
  c8b7337... book-tree: use g_signal_connect_object()
  d3ccd80... book-tree: spring clean-up
  9a49394... Update .gitignore
  34568d2... keyword-model: spring clean-up
  9dc9864... sidebar: better variable and function names for idles
  54217a3... sidebar: dispose() before finalize()
  aa6cb18... sidebar: remove idle functions in dispose()

Commits added to the branch:

  8c6f32f... book-manager: fix fixme about decrementing language count
  65986f2... book-manager: remove dead code
  99e24e2... book-manager: include only glib-object.h in the header
  4b0e582... book-manager: avoid double negation
  714c97e... book-manager: better document instance variables
  43da6c5... Use G_SOURCE_REMOVE instead of FALSE in GSourceFuncs
  9e9d5ca... Deprecate dh_book_manager_get_languages()
  2137368... Remove some useless #includes
  20b8bfa... book: better document instance variables
  00302c8... book: deprecate unused comparison functions
  a56530c... book-manager: connect to DhBook signals with g_signal_conne
  3d1aadf... book-tree: use g_signal_connect_object()
  d5f3277... book-tree: spring clean-up
  6fad50b... Update .gitignore
  f2dc58d... keyword-model: spring clean-up
  5fcb9ca... sidebar: better variable and function names for idles
  ddd5c62... sidebar: dispose() before finalize()
  e70350b... sidebar: remove idle functions in dispose()