Contextual menu work

Group inspect action alone as requested and reorganized action as
proposed. Now we have

--- OPEN ACTION ---
open here
open there
open everywhere
--- SAVE ---
save link as..
--- LINK RELATED
copy link
bookmark link
share link
----
inspect
.

"Save link" is the text chosen in KDE, webkit, chrom* && firefox. I
don't want to change it.