Debug-Sections for Release

This is a cleanup of the published Debug Sections in Squid 3.0.

Source files are only altered in the commented DEBUG: areas. All changes
are to better prepare these sections for automatic processing. Some are
to bring code sections marked with unknown (ie "section ??") up to date
by marking with the actual section that is already being used in the code.
Have also updated the mk-debugs.sh patterns to include more inclusive
filepath expansions actually used for locating and sorting these DEBUG:
tags.