add another padding parameter in config file, update documentation and sample config file

git-svn-id: http://tint2.googlecode.com/svn/trunk@28 121b4492-b84c-0410-8b4c-0d4edfb3f3cc

src/util/area.h

@@ -75,7 +75,9 @@ typedef struct {
    // need redraw Pixmap
    int redraw;
    int use_active, is_active;
-   int paddingx, paddingy;
+   // paddingxlr = horizontal padding left/right
+   // paddingx = horizontal padding between childs
+   int paddingxlr, paddingx, paddingy;
    // parent Area
    void *parent;