Fixed some Expression and Operand memory issues.

Operand.cpp

@@ -7,7 +7,7 @@ namespace jet {
    Operand::Operand(coreutils::ZString &in) {
 
       in.skipWhitespace();
-
+      std::cout << "op: [" << in.unparsed() << "]" << std::endl;
       if(in.ifNext("SUBSTRING")) {
 	 if(!in.ifNext("("))
 	   throw coreutils::Exception("Expecting ( for SUBSTRING parameters.");
@@ -48,10 +48,9 @@ namespace jet {
 	 boolean = false;
 	 string = "false";
 	 return;
-      } else if(in.startsWithDouble()) {
-	 char *temp = in.getCursor();
+      } else if(in.startsWithNumber()) {
 	 doubleValue = in.asDouble();
-	 string = coreutils::ZString(temp, in.getCursor() - temp);
+	 string = std::to_string(doubleValue);
          return;
       } else if(in.ifNext("'")) {
 	 string = in.getTokenExclude("'");