[PATCH] GUI for hover close button option

[Thomas McGuire]

I corrected the patch.
The following changed :

- Hover close buttons are not enabled by default
- No line break in "What's this" help
- Changed the "What's this" help completely, since it did not   
  contain the word "tab". Please review the string, as I am really   
  not sure if it's correct ("mouse" or "the mouse"? "in the tab" or 
  "on the tab"?)

Note that still 4 files are attached, I have no idea how to merge 
them. And I am also still using my backup directory for doing the 
diffs because I am mainly working offline. Hope this does not 
create to much trouble.

If the patch seems correct to you, please commit.

Thanks,
Thomas
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