make elements of array generators unique (for arrays with unique elements)

by using a unique selection with unique result, instead of "uselect"

frontend/postparse.icl

@@ -440,7 +440,6 @@ transformGenerator {gen_kind=IsArrayGenerator, gen_expr, gen_pattern, gen_positi
 	  less_or_equal = get_predef_id PD_LessOrEqualFun
 	  sub = get_predef_id PD_SubFun
 	  usize = get_predef_id PD_UnqArraySizeFun
-	  uselect = get_predef_id PD_UnqArraySelectFun
 	  pattern = PE_Tuple [gen_pattern, array]
 	= case index_generator of
 		No
@@ -453,7 +452,7 @@ transformGenerator {gen_kind=IsArrayGenerator, gen_expr, gen_pattern, gen_positi
 			  		,	tg_lhs_arg = [i, n, array]
 			  		,	tg_case_end_expr = PE_List [i,PE_Ident less_or_equal, n]
 			  		,	tg_case_end_pattern = PE_Basic (BVB True)
-					,	tg_element = PE_List [PE_Ident uselect, array, i]
+					,	tg_element = PE_Selection (ParsedUniqueSelector True) array [PS_Array i]
 					,	tg_element_is_uselect=True
 					,	tg_pattern = pattern
 					,	tg_rhs_continuation = [PE_List [PE_Ident inc, i], n, array]
@@ -469,7 +468,7 @@ transformGenerator {gen_kind=IsArrayGenerator, gen_expr, gen_pattern, gen_positi
 			  		,	tg_lhs_arg = [n,array]
 			  		,	tg_case_end_expr = PE_List [i,PE_Ident less_or_equal, n]
 			  		,	tg_case_end_pattern = PE_Basic (BVB True)
-					,	tg_element = PE_List [PE_Ident uselect, array, i]
+					,	tg_element = PE_Selection (ParsedUniqueSelector True) array [PS_Array i]
 					,	tg_element_is_uselect=True
 					,	tg_pattern = pattern
 					,	tg_rhs_continuation = [n,array]
@@ -482,7 +481,7 @@ transformGenerator {gen_kind=IsArrayGenerator, gen_expr, gen_pattern, gen_positi
 					,	tg_lhs_arg = [array]
 			  		,	tg_case_end_expr = PE_Empty
 			  		,	tg_case_end_pattern = PE_Empty
-					,	tg_element = PE_List [PE_Ident uselect, array, i]
+					,	tg_element = PE_Selection (ParsedUniqueSelector True) array [PS_Array i]
 					,	tg_element_is_uselect=True
 					,	tg_pattern = pattern
 					,	tg_rhs_continuation = [array]