Fix EZP-19986: Router URLAlias permission issue

Fixed by removing Location from URLAlias.
This avoids the permission checking on Location, and potentially
speeds up Routing by removing unused overhead.
Fix EZP-20004: Settings incorrectly dumped by ezpublish:configure

Make sure the image variations settings is dumped for each siteaccess
Fix EZP-20004: Settings incorrectly dumped by ezpublish:configure

Make the converter a bit smarter to not duplicate image variations
settings if it's the same for all siteaccess.
Fix #EZP-20034: Relation Field external data is not stored
Updated: bring back urlalias_compat transformation group, add internal parameter to publish method
Updated: added dedicated method for updating path_identification_string, fixed contentobject_is_published not being always 1, fixed moveSubtreeNodes() to handle path_identification_string
Fixed: copySubtree() handles path_identification_string, updated call to moveSubtreeNodes()
Updated tests for copying and moving subtree
Tested: publishUrlAliasForLocation() updates path_identification_string for location
Updated: updating metadata and publishing updates path identification string
Deprecate contentType instance on Content[Info] object

Usually not used on Content objects with the exceptions of in admin interfaces.
By removing it, Content becomes simpler to cache and generate.
Merge remote-tracking branch 'origin/ezp-20004_setting_dump_images_siteaccess'
Merge remote-tracking branch 'origin/pathidentificationstring'
Sync PHPDoc on API & SPI FieldType interfaces a bit
Remove broken ->getEmptyValue() on abstract FielType\BinaryBase\Type
Merge pull request #146 from bdunogier/EZP-20034

Fix #EZP-20034: Relation Field external data is not stored
Fix REST to support getting LocationId as well as of Path
Merge pull request #141 from ezsystems/EZP19986

Fix EZP-19986: Router URLAlias permission issue
Revert "Fix REST to support getting LocationId as well as of Path"

This reverts commit 9c31837df29312179cb0d84021cc5e92faea1d30.
Generate /content/locations?id=xyz style of URL to location in UrlAlias resource