Added photo frame desklet
[Launcher desklet] Use on_desklet_clicked API
Merge pull request #1588 from dalcde/launcher-desklet-fix

[Launcher desklet] Use on_desklet_clicked API
Photo-frame desklet: fixed memory leak, added sepia/black-and-white effects, added animations, added fade-delay
Merge branch 'master' of github.com:linuxmint/Cinnamon
Photo frame desklet: high quality sepia by default, shuffle pictures, middle-click to open picture in image viewer
Merge remote-tracking branch 'upstream/master'
[panels] Simpler, more descriptive panel-layout names

"Traditional" -> "Bottom"
"Flipped" -> "Top"
"Classic" -> "Top + Bottom"
"Classic Flipped" -> "Bottom + Top"
[panels] Take some precautions parsing the panel numbers.