Fix generated HTTP message version labels

Squid being conditionally compliant with RFC 2616 should be handling
HTTP/1.1 at all times unless another version was explicitly received.

This makes the default version number for all generated messages be 1.1
unless the alternative constructor is used or the numeric members are
explicitly set to other values. As a result all Squid generated messages
are labelled correctly as 1.1 by default now.

Fixes message version details sent to ICAP/eCAP on many error or
internally generated responses.
Fix eCAP to build after patch r13384

The HttpMsg::protocol removed with "Bug 1961: pt1: URL handling redesign" patch,
and as a result the eCAP squid subsystem does not build because used this memberto implement libecap::RequestLine and libecap::StatusLine classes.
The HttpMsg::protocol used to hold the protocol part of the request URI.
However the libecap::FirstLine::protocol() is meant for things like
 * the HTTP-Version part of HTTP messages (in RFC 2616 terminology) or
 * the ICAP-Version part of ICAP messages (in RFC 3507 terminology).
It is not related to the URI. 

This patch fix this and now libecap::RequestLine and libecap::StatusLine 
implemented to return the protocol information from request or status line 
of headers.
Release Notes for Squid-3.5
Release Notes 3.5
storeid_file_rewrite: document concurrency handling
Support concurrency channels in Digest authentication helpers

All bundled digest helpers will now automatically detect the existence
of a concurrecy channel-ID and adjust responses appropriately.

The auth_param children concurrency= parameter can now be set to any
valid value without needing to alter the helper binary. This resolves
issues upgrading to default-on concurrency on the digest auth interface.
url_fake_rewrite: concurrency channel support
Cleanup: Refactor external_acl_type format codes representation

Removes enum_external_acl_format::format_type from external_acl.cc
by replacing it with enum Format::ByteCode_t.

Several missing logformat codes related to URL display have been added
to the logformat token set for general use.

Several of the external ACL format codes have been added to
Format::ByteCode_t without equivalent logformat TokenTableEntry's at
this stage as both desirable token naming and access to the data to
produce them generically is unclear.

The external_acl_type parser is updated to accept logformat tokens
wherever an equivalent exists and map directly to the ByteCode_t values.

The mgr:config report dumper is also updated to output the logformat
tokens. But as yet the official deprecation has not been done in
squid.conf.
Release Notes 3.5: updated helper concurrency status
SourceFormat Enforcement
Bug 4059: Support redirectors and logging using Squid-2 urlgroup feature
Allow test suite to override make program via MAKE environment variable
Temporary fix for segmentation faults in FwdState::serverClosed.

r13388 (cache_peer standby=N) moved noteUses() call from Comm to FwdState, to
avoid exposing Comm to pconn pools. Unfortunately, the closing handler does
not get a valid FD value when the closing callback shares the Connection
object with the code that called conn->close(). It gets -1. The FD of the
FwdState connection itself is already -1 at that point, for similar reasons.
The code thinks it got a matching FD and calls noteUses() with an invalid FD.

This temporary workaround prevents noteUses() calls when FD is unknown.
Without those calls, pconn usage statistics will be wrong. A different
long-term solution is needed.
SourceFormat Enforcement
Temporary fix for segmentation faults in FwdState::serverClosed debugging.

See r13404 for details.
author: Alex Rousskov <rousskov@measurement-factory.com>
Avoid on-exit crashes when adaptation is enabled.

After trunk r13269 (Vector refactor) destroyed vector objects still have
positive item counts. This exposes use-after-delete bugs. In this particular
case, global adaptation rule/group/service arrays are destructed by global
destruction sequence first and then again by Adaptation::*::TheConfig objects
destructors.

This change avoiding static destruction order dependencies by storing those
global adaptation arrays on heap.
Check for PURGE method using method enum instead of strcmp()

Removes one minor but needless drag on startup and reconfigure speed.
Integrate delayer helper with build system
Changed subst_perlshell Makefile recipe to use the actual source file name
Renamed installed script to ext_delayer_acl