Clearlooks Overcast (gtk2 & gtk3)

Grey variation for Clearlooks theme, with a more "sharp/square" aspect. Available for gtk2 and gtk3.
Gtk3 port based on Clearlooks-Phenix theme, and available in 2 versions:
- for gtk3.4 (Debian Wheezy)
- for gtk3.14 (Debian Jessie)
This theme contains also an additional version "dark desktop panel" for XFCE.

2.2 : dark panel version for xfce4-panel
2.1 : better color settings for "notebook active tab" item (gtk3.4 and gtk3.14 versions)
2.0 : - Several changes made in gtk3.4 and gtk3.14 settings: new border-radius settings for ".frame", ".menubar", ".notebook tab" and ".progressbar" ; new strip_gradient settings for active ".notebook tab" ; new ".progressbar" color style. These items have now (almost) the same appearance as their corresponding items on gtk2.
- Fix in gtk3.14 version: change the 0 values by 2px for ".notebook tab.top/right/bottom/left"
- A new title for this theme: The title changes from "Dark Grey" to "Overcast". It better reflects the "grey" (cloudy weather) variation of the original "blue" theme.
1.9 : gtk3 "GtkScale.trough" width settings corrected (gtk3.4 version)
1.8 : quick fix for a gtk parsing error about gtk-widgets.css (gtk3.14 version) ; GtkScale margins corrected (gtk3.14 version)
1.7 : gtk3 "scale-slider-horz-hover.png" and "scale-slider-vert-hover.png" have now the same appearance as their corresponding items on gtk2 ; new border-radius settings for gtk3 scrollbar buttons (now similar to gtk2)
1.6 : "notebook" fix (gtk3.14 version) ; better settings for "button" item (gtk3.4 and gtk3.14 versions)
1.5 : gtk3 port for gtk3.14 version
1.4 : color setting fix for the gtk3 "scrollbar"
1.3 : minor tuning for gtk3 and gtk2
1.2 : gtk3 port for gtk3.4
1.1 : minor change inside ' style "notebook" ' ( change the x/ythickness values from 3 to 2 )