bug#7787: 23.2; wrong meaning for mouse-2 while in search mode

[Drew Adams]

> what about introducing a new user option like
> `isearch-mouse-yank-append' or something?

https://debbugs.gnu.org/cgi/bugreport.cgi?bug=7787#90
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 isearchp-mouse-2-flag is a variable defined in `isearch+.el'.

 Its value is t

 Documentation:

 Non-nil means clicking `mouse-2' during Isearch yanks the selection.
 In that case, you can select text with the mouse, then hit `C-s' to
 search for it.

 If the value is nil, yank only if the `mouse-2' click is in the echo
 area.  If not in the echo area, invoke whatever `mouse-2' is bound to
 outside of Isearch.

 You can customize this variable.
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