Use parameteric dimensions in the graph creation instead of hard coded constants.

Use parameteric dimensions in the graph creation instead of hard coded constants.
Remove the temporary file and sorting in graph creation.
Add the redirector_log option in sarg.conf to read a log file created by squidGuard or Rejik (thanks to Maxim Britov for pointing out this missing option).
Allow up to 64 redirector log files to be passed through the command line option -L and the sarg.conf option redirector_log.
Configuration option squidguard_log_format renamed into redirector_log_format for equity with the various redirectors that can be used with sarg.