Progress: continue to develop logging and fix other issues

Progress: continue to develop logging and fix other issues

Corrected typo in c_base_return_arrray (removing the extra 'r').

Add get_request_headers() function to c_base_http.

Fix problems in return value of c_base_http::get_request_uri_relative().

Add get_request_uri_query() function to c_base_http.

Incorrect constant name used in p_load_request_accept_datetime().

Add function pr_do_log_user_activity() to c_standard_index to log access logs and responses to the database.