Added a blinking icon to force_encounter/with_flags functions

* currently an icon is always shown for scripted force encounters.

artifacts/scripting/headers/lib.math.h

@@ -11,7 +11,7 @@
 #define below_equal(a, b)  (unsigned_comp(a, b) <= 0)
 
 procedure unsigned_comp(variable a, variable b) begin
-   if (a bwxor b) then return 0;
+   if ((a bwxor b) == 0) then return 0; // a == b
    if (b == 0) then return 1;
    return 1 if (a / b) else -1;
 end

artifacts/scripting/headers/sfall.h

@@ -80,6 +80,7 @@
 //Valid flags for force_encounter_with_flags
 #define ENCOUNTER_FLAG_NO_CAR   (1)
 #define ENCOUNTER_FLAG_LOCK     (2) // block new forced encounter by the next function call until the current specified encounter occurs
+#define ENCOUNTER_FLAG_SPECIAL  (4) // special blinking icon
 
 //The attack types returned by get_attack_type
 #define ATKTYPE_LWEP1           (0)

artifacts/scripting/hookscripts.txt

@@ -681,5 +681,5 @@ int     arg1 - event type: 0 - when a random encounter occurs, 1 - when the play
 int     arg2 - the map ID that the encounter will load (see MAPS.h or Maps.txt)
 int     arg3 - 1 when the encounter occurs is a special encounter, 0 otherwise
 
-int     ret1 - overrides the map ID, or pass -1 to cancel the encounter and continue traveling (only for event type 0)
+int     ret1 - overrides the map ID, or pass -1 for event type 0 to cancel the encounter and continue traveling
 int     ret2 - pass 1 to cancel the encounter and load the specified map from the ret1 (only for event type 0)

artifacts/scripting/sfall function notes.txt

@@ -137,7 +137,7 @@ array - array ID to be used with array-related functions (actually an integer)
 - The player will not get an outdoorsman skill check.
 
 > void force_encounter_with_flags(int map, int flags)
-- does the same thing as force_encounter, but allows the specification of some extra options.
+- does the same thing as force_encounter, but allows the specification of some extra options (see sfall.h for available flags).
 - Forcing a random encounter on a map that is not normally used for random encounters may cause the player to lose the car, if they have it.
 - In this case use force_encounter_with_flags with the ENCOUNTER_FLAG_NO_CAR flag set.
 
@@ -703,7 +703,7 @@ optional argument:
 - NOTE: this function works only for English letters of A-Z/a-z
 
 > void sfall_func3("set_terrain_name", int x, int y, string name)
-- overrides the terrain type name for the sub-tile by the specified coordinates on the world map
+- overrides the terrain type name for the sub-tile on the world map by the specified coordinates
 
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 ------ MORE INFO -------