[gthumb] (40 commits) ...reverted wrong change

[Paolo Bacchilega <paobac src gnome org>]

Summary of changes:

  83433d8... emit a beep when there is no next or previuos file
  41422c1... Speed-up image loading
  df17e42... Use a two step policy to load images
  60fe5fd... specify the DEBUG macro when --debug is used
  b6c5456... importer: load the file in memory only if required
  13ccd19... fixed shirnk_wrap regression with two steps loading
  c0d5944... removed the unused editor page definition
  370f1a2... update the ui when the viewer changes
  dd6f149... use a gcancellable to cancel a file loading
  181d70b... fixed crash when the animation is null
  94bf819... no need to have the image loader inside the image viewer
  919e526... removed the IMAGE_READY signal from the image viewer
  5c85cc3... overwrite dialog: load previews at 256x256
  4163ed0... removed other unused functions
  92c619f... removed other unused functions
  69f25bc... gth-image-loader: use callbacks instead of signals
  6e314a9... Fixed other bugs related to image loading cancellation
  50826e4... gth-thumb-loader: fixed function names
  cee9416... use a smaller timeout for the non-requested images
  6f5af74... translate the origin by 0.5 instead of adding 0.5 to all th
  34a46b0... slideshow: copy the static image to avoid a crash
  e140cb8... grid not visible when using cario >= 1.9.2
  cd3fbc9... always use normalize_thumb to scale the thumbnail at the re
  dd397fa... fixed image scrolling when the image is zoomed
  4c103c3... Merge branch 'faster-viewer'
  76f5137... do not load hidden thumbnails for web albums to save bandwi
  dc71ddb... check the thumbnail validity without loading the pixbuf
  bd83330... misc thumbnail generation changes
  0a18713... make sure closing is executed only once
  57de096... Minor speed optimization in the thumb loader
  595e107... thumb loader: create the thumbnails for all the images
  18bf7fa... link to the math library explicitly
  cec72f5... thumb loader: fixed generation of thumbs with external scri
  246f3d9... set a lower priority for thumbnail loading
  9c93694... cancel the file list operations before closing the dialog
  2583f42... files with no thumbnail not loaded correctly
  b426544... removed unnecessary operations when the original size is re
  f34a08c... the image selector is slow at activation time if the image 
  99a78cc... fixed the closing of the main window
  161bd85... reverted wrong change