Added "floor2" script function to work with ceil (#109)

Added the missing description of ceil to notes.txt.
Disabled ceil marco in lib.math.h.
Removed duplications in Utils.h.

artifacts/scripting/headers/lib.math.h

@@ -26,15 +26,14 @@ end
    return intp;
 end*/
 
-procedure ceil(variable val) begin
+/*procedure ceil(variable val) begin
    variable intp;
    intp := floor(val);
    if (abs(val-intp) > 0.0) then begin
       intp++;
    end
    return intp;
-end
+end*/
-
 
 procedure cap_number(variable num, variable min, variable max) begin
    if (num > max) then num := max;

artifacts/scripting/headers/sfall.h

@@ -191,6 +191,7 @@
 
 #define critter_inven_obj2(obj, type)         sfall_func2("critter_inven_obj2", obj, type)
 #define exec_map_update_scripts               sfall_func0("exec_map_update_scripts")
+#define floor2(value)                         sfall_func1("floor2", value)
 #define intface_hide                          sfall_func0("intface_hide")
 #define intface_is_hidden                     sfall_func0("intface_is_hidden")
 #define intface_redraw                        sfall_func0("intface_redraw")

artifacts/scripting/sfall function notes.txt

@@ -265,6 +265,9 @@ Some utility/math functions are available:
 > float exponent(float x)
 - e^x
 
+> int ceil(float x)
+- round x to the nearest integer that is not less than x
+
 > int round(float x)
 - round x to the nearest integer
 
@@ -378,6 +381,10 @@ Some utility/math functions are available:
 - The file name is limited to 63 chars, including the extension
 - The section name is limited to 32 characters
 
+> int sfall_func1("floor2", int/float value)
+- works just like vanilla floor function, but returns correct integers for negative values
+- vanilla floor function works exactly the same as ceil for negative values, much like trunc in C/C++
+
 ------------------------
 ------ MORE INFO -------
 ------------------------

sfall/ScriptOps/MetaruleOp.hpp

@@ -113,6 +113,7 @@ static const SfallMetarule metaruleArray[] = {
 	{"intface_is_hidden", sf_intface_is_hidden, 0, 0},
 	{"exec_map_update_scripts", sf_exec_map_update_scripts, 0, 0},
 	{"set_ini_setting", sf_set_ini_setting, 2, 2},
+	{"floor2", sf_floor2, 1, 1},
 };
 
 static void InitMetaruleTable() {

sfall/ScriptOps/ScriptUtils.hpp

@@ -891,3 +891,7 @@ static void _stdcall op_message_str_game2() {
 static void __declspec(naked) op_message_str_game() {
 	_WRAP_OPCODE(op_message_str_game2, 2, 1)
 }
+
+static void sf_floor2() {
+	opHandler.setReturn(static_cast<int>(floor(opHandler.arg(0).asFloat())));
+}