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()

Add support for non-scalar Iterator keys in foreach

RFC: https://wiki.php.net/rfc/foreach-non-scalar-keys

Adding in NEWS/UPGRADING about process title change support.

- damned conflicts

Merge branch 'PHP-5.5'

* PHP-5.5:
- add test for imagecropauto
- (s)rgb distance works way better for now, re enable threshold
- disable threshold for now, will enable it a

Merge branch 'PHP-5.5'

* PHP-5.5:
- add test for imagecropauto
- (s)rgb distance works way better for now, re enable threshold
- disable threshold for now, will enable it again using CIEDE2000
- add todo for threshold
- clean and enable threshold
- add image crop support

Conflicts:
UPGRADING

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- add test for imagecropauto

- disable threshold for now, will enable it again using CIEDE2000

- add image flip API support

NEWS/UPGRADING for changes in sockets, intl

Add news for bug #60524

oops, unintended addition

post-5.5 changes for bug #46439 as described in the RFC

Merge branch 'PHP-5.5'

* PHP-5.5:
Implement fix for bug #46439 - add CURLFile class for safer uploads

Conflicts:
UPGRADING

Implement fix for bug #46439 - add CURLFile class for safer uploads

add new features

fix bug #60833 - self, parent, static behave inconsistently case-sensitive

Tinker with UPGRADING's wording for the format string changes for clarity.

Deprecate ext/mysql.

Per https://wiki.php.net/rfc/mysql_deprecation, connecting to a MySQL database
via ext/mysql now generates an E_DEPRECATED error. This commit includes the
minima

Deprecate ext/mysql.

Per https://wiki.php.net/rfc/mysql_deprecation, connecting to a MySQL database
via ext/mysql now generates an E_DEPRECATED error. This commit includes the
minimal EXPECTF updates required for the test suite to pass: it may be
preferable to refactor some of the tests to suppress deprecation errors in
situations where no other error is expected from mysql_[p]connect(), but I'm
not enough of a MySQL expert to want to get my hands that dirty in a long
standing test suite.

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Slight performance improvement

Optimized access to temporary and compiled VM variables

. The VM stacks for passing function arguments and syntaticaly nested calls were merged into a single stack. The stack size needed for op_array execution is calculated at compile time and preallocate

. The VM stacks for passing function arguments and syntaticaly nested calls were merged into a single stack. The stack size needed for op_array execution is calculated at compile time and preallocated at once. As result all the stack push operatins don't require checks for stack overflow any more.
. Generators implementation was improved using the new VM stack. Now it's a bit more clear and faster.

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