Replaced any internal call to WGI_RESPONSE.write () by the associated implementation (i.e output.put_string (...) )
Added WGI_OUTPUT_STREAM.put_crlf
Renamed WSF_RESPONSE.put_response (a_message) as `send (a_message)'
WSF_RESPONSE_MESSAGE.send_to (res) is now exported only to WSF_RESPONSE
The descendant has to implement the function
response (ctx: C; req: WSF_REQUEST): WSF_RESPONSE_MESSAGE
Added related features and class in WSF_ROUTER to be able to use agent easily.