Changed startsWithDouble to startsWithNumber.

ZString.cpp

@@ -322,13 +322,8 @@ namespace coreutils {
       return strncmp(cursor, value, strlen(value)) == 0;
    }
 
-   bool ZString::startsWithDouble() {
-      push();
-      char *tempc = cursor;
-      double temp = strtod(cursor, &cursor);
-      int diff = cursor - tempc;
-      pop();
-      return diff != 0;
+   bool ZString::startsWithNumber() {
+      return ((*cursor >= '0') && (*cursor <= '9'));
    }
 
    int ZString::compare(ZString zstring) {