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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Add the new password functions to UPGRADING.

As a public service announcement on behalf of the documentation team, please
remember to update UPGRADING as well as NEWS when adding feature

Add the new password functions to UPGRADING.

As a public service announcement on behalf of the documentation team, please
remember to update UPGRADING as well as NEWS when adding features to master or
an alpha branch. :)

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Add actual branch version number to UPGRADING

Remove PHP 5.5 changes from master UPGRADING

Put the new php.ini directives together.

(And make colon usage more consistent.)

Move the deprecated functions up to the Deprecated Functionality section so
they're more visible.