clicklook (main trunk only)

This allows the use of the right mouse button to
look at things on the screen when the
'clicklook' option is set.

Concept came from a patch for 3.4.0
that I saw referenced on r.g.r.n
[see http://www.steelskies.com/nethack.php]
but the implementation is different.

src/options.c

@@ -68,6 +68,7 @@ static struct Bool_Opt
 #else
 	{"checkspace", (boolean *)0, FALSE, SET_IN_FILE},
 #endif
+	{"clicklook", &iflags.clicklook, FALSE, SET_IN_GAME},
 	{"cmdassist", &iflags.cmdassist, TRUE, SET_IN_GAME},
 # if defined(MICRO) || defined(WIN32)
 	{"color",         &iflags.wc_color,TRUE, SET_IN_GAME},		/*WC*/