Defined dynamic class vars in eZURLAliasML

This satisfies IDEs and helps with debugging
Merge branch 'master', remote-tracking branch 'upstream/master'
Fix ezjscore CSS packer not recognizing paths to files containing GET parameters with values
EZP-21768: Changed var comparison to assignment
EZP-21773: Set reference to false if setting is empty
EZP-21154 : cleanup script
Fix EZP-21883: Regression from ezp-21357 with images with utf-8 names
EZP-21913: Fixed globals for scripts:

- updateniceurls.php
- runcronjobs.php
- ezasynchronouspublisher.php
- ezsubtreecopy.php
Doc EZP-21913: Add bc note on global use in bin/php scripts
Fix EZP-21914: reset ezcDb link from ezasynchronouspublishing.php
Merge pull request #832 from ezsystems/fix/EZP-21914-asyncpublishing_new_stack_db_link

Fix EZP-21914: reset ezcDb link from ezasynchronouspublishing.php
Merge pull request #831 from ezsystems/fix_EZP-21913_5.2_release

EZP-21913: Fixed globals for critical scripts
Fix EZP-21919: editing workflows concurrently in 2 browser windows makes them disappear
Merge pull request #833 from gggeek/EZP-21919

Fix EZP-21919: problems editing workflows concurrently in 2 browser windows
Fix EZP-21903: Copy & paste with chrome insert non break space
Implemented EZP-20816: Added new index on ezcontentobject_attribute

Reflected changes on version update scripts
Pushing the enhancement to 5.3
Set version in postgre update script

Ref: https://jira.ez.no/browse/EZP-20816
Merge pull request #772 from ezsystems/ezp20816_index_contentclassattribute_id

Implemented EZP-20816: Added new index on ezcontentobject_attribute
Merge pull request #791 from jeromegamez/ezimagemanager_reference

EZP-21773: Make sure that image reference is false if ini setting 'Reference' is empty
Fix EZP-21929: eZOE searchreplace plugin interface is broken
Update phpdoc on ezpEvent:filter to reflect actual implementation