Made -D option work with -O and -J.

To achieve this, first new structure HeaderData is defined to hold
necessary data to perform header-related work.  Then tool_header_cb now
receives HeaderData pointer as userdata.  All header-related work
(currently, dumping header and Content-Disposition inspection) are done
in this callback function.  HeaderData.outs->config is used to determine
whether each work is done.

Unit tests were also updated because after this change, curl code always
sets CURLOPT_HEADERFUNCTION and CURLOPT_HEADERDATA.

Tested with -O -J -D, -O -J -i and -O -J -D -i and all worked fine.

tests/data/test1400

@@ -85,6 +85,8 @@ int main(int argc, char *argv[])
   CURLOPT_STDERR set to a objectpointer
   CURLOPT_DEBUGFUNCTION set to a functionpointer
   CURLOPT_DEBUGDATA set to a objectpointer
+  CURLOPT_HEADERFUNCTION set to a functionpointer
+  CURLOPT_HEADERDATA set to a objectpointer
 
   */
 

tests/data/test1401

@@ -104,6 +104,8 @@ int main(int argc, char *argv[])
   CURLOPT_STDERR set to a objectpointer
   CURLOPT_DEBUGFUNCTION set to a functionpointer
   CURLOPT_DEBUGDATA set to a objectpointer
+  CURLOPT_HEADERFUNCTION set to a functionpointer
+  CURLOPT_HEADERDATA set to a objectpointer
 
   */
 

tests/data/test1402

@@ -92,6 +92,8 @@ int main(int argc, char *argv[])
   CURLOPT_STDERR set to a objectpointer
   CURLOPT_DEBUGFUNCTION set to a functionpointer
   CURLOPT_DEBUGDATA set to a objectpointer
+  CURLOPT_HEADERFUNCTION set to a functionpointer
+  CURLOPT_HEADERDATA set to a objectpointer
 
   */
 

tests/data/test1403

@@ -87,6 +87,8 @@ int main(int argc, char *argv[])
   CURLOPT_STDERR set to a objectpointer
   CURLOPT_DEBUGFUNCTION set to a functionpointer
   CURLOPT_DEBUGDATA set to a objectpointer
+  CURLOPT_HEADERFUNCTION set to a functionpointer
+  CURLOPT_HEADERDATA set to a objectpointer
 
   */
 

tests/data/test1404

@@ -141,6 +141,8 @@ int main(int argc, char *argv[])
   CURLOPT_STDERR set to a objectpointer
   CURLOPT_DEBUGFUNCTION set to a functionpointer
   CURLOPT_DEBUGDATA set to a objectpointer
+  CURLOPT_HEADERFUNCTION set to a functionpointer
+  CURLOPT_HEADERDATA set to a objectpointer
 
   */
 

tests/data/test1405

@@ -103,6 +103,8 @@ int main(int argc, char *argv[])
   CURLOPT_STDERR set to a objectpointer
   CURLOPT_DEBUGFUNCTION set to a functionpointer
   CURLOPT_DEBUGDATA set to a objectpointer
+  CURLOPT_HEADERFUNCTION set to a functionpointer
+  CURLOPT_HEADERDATA set to a objectpointer
 
   */
 

tests/data/test1406

@@ -95,6 +95,8 @@ int main(int argc, char *argv[])
   CURLOPT_STDERR set to a objectpointer
   CURLOPT_DEBUGFUNCTION set to a functionpointer
   CURLOPT_DEBUGDATA set to a objectpointer
+  CURLOPT_HEADERFUNCTION set to a functionpointer
+  CURLOPT_HEADERDATA set to a objectpointer
 
   */
 

tests/data/test1407

@@ -75,6 +75,8 @@ int main(int argc, char *argv[])
   CURLOPT_STDERR set to a objectpointer
   CURLOPT_DEBUGFUNCTION set to a functionpointer
   CURLOPT_DEBUGDATA set to a objectpointer
+  CURLOPT_HEADERFUNCTION set to a functionpointer
+  CURLOPT_HEADERDATA set to a objectpointer
 
   */