Logging options are set as section,level where each source file
	is assigned a unique section.  Lower levels result in less
	output,  Full debugging (level 9) can result in a very large
	log file, so be careful.

	The magic word "ALL" sets debugging levels for all sections.
	The default is to run with "ALL,1" to record important warnings.

	The rotate=N option can be used to keep more or less of these logs
	than would otherwise be kept by logfile_rotate.
	For most uses a single log should be enough to monitor current
	events affecting Squid.