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

@@ -213,6 +213,7 @@
 #define critter_inven_obj2(obj, type)         sfall_func2("critter_inven_obj2", obj, type)
 #define display_stats                         sfall_func0("display_stats")
 #define exec_map_update_scripts               sfall_func0("exec_map_update_scripts")
+#define floor2(value)                         sfall_func1("floor2", value)
 #define get_cursor_mode                       sfall_func0("get_cursor_mode")
 #define get_flags(obj)                        sfall_func1("get_flags", obj)
 #define get_ini_section(file, sect)           sfall_func2("get_ini_section", file, sect)

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++
+
 > int sfall_func1("item_weight", object)
 - gets the current weight of an object