Streamlining of cookie handling in ext/session and setcookie

Up until now the session cookie used "HttpOnly" to indicate cookies
only available through HTTP while setcookie() used "httponly".  The
relevant RFC 6265 claims that case does not matter for this token,
but only explicitely mentions "HttpOnly".  Thus this seems like a
logical choice when streamlining the code.

Also the setcookie implementation now uses the same string constants
as the session extension for other tokens like Max-Age or the domain
attribute.

This change poses a slight risk of backwards incompatibility in places
where people deliberately ignore chapter 5.2.5 of RFC 6265 and perform
case-sensitive checks for the HttpOnly attribute.
Remove usage of pointless COOKIE_SET_COOKIE constant.
Add line in run-tests.php help
5.4.30 rc1
Fix bug #66127 (Segmentation fault with ArrayObject unset)
5.5.15 now
Revert "Add optional second arg to unserialize()"

This reverts commit cfd104582220d578ab1b78a5991065d038e1f931.
Merge branch 'PHP-5.6'

* PHP-5.6:
  Revert "Add optional second arg to unserialize()"
Fix issue #89 — Compile failure in PHP 5.4

zend_hash_get_current_key_zval_ex isn't defined in PHP 5.4. (used in phpdbg_watch.c)
Fix potential segfault in dns_get_record()

If the remote sends us a packet with a malformed TXT record,
we could end up trying to over-consume the packet and wander
off into overruns.
Merge branch 'PHP-5.4' into PHP-5.5

* PHP-5.4:
  Fix potential segfault in dns_get_record()
Merge branch 'PHP-5.5' into PHP-5.6

* PHP-5.5:
  Fix potential segfault in dns_get_record()
Merge branch 'PHP-5.6'

* PHP-5.6:
  Fix potential segfault in dns_get_record()
Check for all phpdbg compitble php versions
Fixed order in travis script
NEWS entry for Fix potential segfault in dns_get_record(
NEWS entry for "Fix potential segfault in dns_get_record()"
NEWS entry for Fix potential segfault in dns_get_record()
Merge branch 'PHP-5.4' into PHP-5.5

* PHP-5.4:
  NEWS entry for "Fix potential segfault in dns_get_record()"
Merge branch 'PHP-5.5' into PHP-5.6

* PHP-5.5:
  NEWS entry for "Fix potential segfault in dns_get_record()"
  NEWS entry for Fix potential segfault in dns_get_record(
  5.5.15 now

Conflicts:
	configure.in
	main/php_version.h