Added: Sort clause for sections
Added: DatePublished sort clause for Solr
Added: methods to enqueue operations to be run at transaction commit
Added: more aliasing
Added: Implementation of the MultipleStringField
Changed: commenting code that doesn't work yet

Object states does not seem to be implemented completely, commenting for
now.
Changed: adapted Solr fixtures against results received
Fix EZP-21048: Change anchor handling to append to url
EZP-21143: Do not execute legacy pagelayout when using eZ5 one

Closes #437
Merge pull request #439 from ezsystems/EZP-21048_additional_fix

Fix EZP-21048: Change anchor handling to append to url
EZP-20069 - Expose SignalSlot repository properly, via a service tag
EZP-20069 - Moved legacy related slots definition to LegacyBundle
EZP-20069 - Implemented a generic slot that converts signals to a Symfony event
EZP-20069 - Added unit tests
EZP-20069 - Added test for SignalSlotPass
EZP-20069 - Added phpDoc

[ci skip]
Merge pull request #440 from ezsystems/signalSlotExposed

EZP-20069: Expose SignalSlot repository properly
 EZP-20071 EZP-20071 - Added new user Identity interface + basic implementation
EZP-20071 - Implemented user hash lookup mechanism in HttpCache
EZP-20071 - Implemented simple hash generator (for a start)