Request non-keep-alive connections by default in HTTP 1.1 requests.

As noted in FR #65634, at present we don't send a Connection request header
when the protocol version is set to 1.1, w

Request non-keep-alive connections by default in HTTP 1.1 requests.

As noted in FR #65634, at present we don't send a Connection request header
when the protocol version is set to 1.1, which means that RFC-compliant Web
servers should respond with keep-alive connections. Since there's no way of
reusing the HTTP connection at present, this simply means that PHP will appear
to hang until the remote server hits its connection timeout, which may be quite
some time.

This commit sends a "Connection: close" header by default when HTTP 1.1 (or
later) is requested by the user via the context options. It can be overridden
by specifying a Connection header in the context options. It isn't possible to
disable sending of the Connection header, but given "Connection: keep-alive" is
the same as the default HTTP 1.1 behaviour, I don't see this as a significant
issue — users who want to opt in for that still can.

As a note, although I've removed an efree(protocol_version), this doesn't
result in a memory leak: protocol_version is freed in the out: block at the end
of the function anyway, and there are no returns between the removed efree()
and the later call. Yes, I ran the tests with valgrind to check that. ☺

Implements FR #65634 (HTTP wrapper is very slow with protocol_version 1.1).

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Update NEWS/UPGRADING with info about incompat ctx

Expose fputcsv's escape_char to userland

Allows users to assert that something other than the backslash
should be considered an escape char; also follows the RFC 4180
recommendation

Expose fputcsv's escape_char to userland

Allows users to assert that something other than the backslash
should be considered an escape char; also follows the RFC 4180
recommendation that fields containing a " be enclosed.

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Merge branch 'pull-request/325' into PHP-5.5

* pull-request/325:
Add schema default/fixed value support

add upgrading notes about bison and 2Guploads

add news about session fix

Update UPGRADING and make typo fixes to OCI8 package.xml

Fix bug #61697 - spl_autoload_functions returns lambda functions incorrectly

Added recursivetreeiterator::setPostfix() method

add a few comment

Add a few links

add fix for #60560 into upgrading

Some tidy-ups: Don't mention Logo GUIDs in three places; mention
password_hash functionality; add some doc URLs for new features;
grammar & typos; formatting changes.

add notes about opcache windows issue and migration from APC

Update NEWS, UPGRADING and UPGRADING.INTERNALS

UPGRADING

Contant has been renamed

format

Update NEWS & UPGRADING

typo and WS

add new functions and constants for GD

Move some internal changes from UPGRADING to UPGRADING.INTERNALS

Add SplDoublyLinkedList::add to UPGRADING

Tweaks an add OPcache info to UPGRADING

add array_column()