added trim operand function.

Operand.cpp

@@ -78,7 +78,13 @@ namespace jet {
 	 } else
 	   throw coreutils::Exception("Expecting ) at end of RIGHT expression.");	 	 
       } else if(in.ifNextIgnoreCase("TRIM")) {
-	 
+	 if(!in.ifNext("("))
+	   throw coreutils::Exception("Expecting ( for TRIM parameters.");
+	 Operand parm1(in, tag);
+	 if(in.ifNext(")")) {
+	    string = parm1.string.trim();
+	 } else
+	   throw coreutils::Exception("Expecting ) at end of TRIM expression.");	 	 	 
       } else if(in.ifNextIgnoreCase("TOUPPER")) {
 	 
       } else if(in.ifNextIgnoreCase("TOLOWER")) {

tests/testexpr.jet

@@ -8,4 +8,6 @@ $[test2]=10
 $[lefty]=01234
 <set name="righty" expr="right($[numbers],5)" />
 $[righty]=56789
+<set name="trim" expr="trim('     this is a test      ')" />
+$[trim]=this is a test
 </jet>