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
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)
Check for all phpdbg compitble php versions
Fixed order in travis script
Merge branch 'httponly-cookies' of https://github.com/mj/php-src
Make run-tests.php PHP-5.4 compatible
Keep 308-399 HTTP response codes when header('Location:') is called.

Fixes bug #67428 (header('Location: foo') will override a 308-399 response
code).
Merge branch 'PHP-5.4' into PHP-5.5

* PHP-5.4:
  Keep 308-399 HTTP response codes when header('Location:') is called.
Merge branch 'PHP-5.5' into PHP-5.6

* PHP-5.5:
  Keep 308-399 HTTP response codes when header('Location:') is called.
Merge branch 'PHP-5.6'

* PHP-5.6:
  Keep 308-399 HTTP response codes when header('Location:') is called.
Add 308 and 426 to the HTTP response code map in the CLI server.

Implements FR #67429 (CLI server is missing some new HTTP response codes).
Merge branch 'PHP-5.4' into PHP-5.5

* PHP-5.4:
  Add 308 and 426 to the HTTP response code map in the CLI server.
Merge branch 'PHP-5.5' into PHP-5.6

* PHP-5.5:
  Add 308 and 426 to the HTTP response code map in the CLI server.
Merge branch 'PHP-5.6'

* PHP-5.6:
  Add 308 and 426 to the HTTP response code map in the CLI server.
Follow 308 Permanent Redirect responses.

Fixes bug #67430 (http:// wrapper doesn't follow 308 redirects).
Merge branch 'PHP-5.4' into PHP-5.5

* PHP-5.4:
  Follow 308 Permanent Redirect responses.
Merge branch 'PHP-5.5' into PHP-5.6

* PHP-5.5:
  Follow 308 Permanent Redirect responses.
Merge branch 'PHP-5.6'

* PHP-5.6:
  Follow 308 Permanent Redirect responses.