[BUGFIX] Fixes various issues with IRRE relations with respect to gridelements

[BUGFIX] Lost relations on copying references in workspaces

[PATCH] Patch from http://forge.typo3.org/issues/29278

[BUGFIX] IRRE children respect 'shadowColumnsForNewPlaceholders'

[BUGFIX] Only update placeholder if it happens to be in a workspace

[HACK] Allow for configuration to skip remapping foreign relations on workspace publish (for gridelements)

[BUGFIX] Respect 'dontRemapRelations' flag in another case, too