logging.pl -- Add SWISH query execution to the HTTP log file

Add a line of the format below to the HTTP log file. The src_text(Text) option of Options is replaced by Hash-Text for the first occurrence and just Hash for subsequent occurrences.

pengine(Time, create(Pengine, Application, Options))

 create_log_dir is det

 create_log_dir(FileSpec) is det

Create the directory for holding the log files