Squid-2.5 internal changes (ctd)

Lots of security fixes
SNMP
FTP
DNS

Lots of bug fixes
Many bug fixes are not easily ported to versions <2.4

Moving towards modularization
(some in 2.4) Filesystem and Authentication types are modules
Automake provides a flexible method of tracking dependencies

2.5 is stable
Personally being run at a handful of places under moderate load
No observable crashes, periods of unavailability