[BUGFIX] Incorrect placement of child elements on paste and localize into flux column

Changed so TYPO3 handles IRRE records in tx_flux_children. Only set tx_flux_parent and tx_flux_column on the copied element in tceMain->cmdmap. Changed tx_flux_parent to a readOnly input so the field is writable according to TCA. Updated/Removed tests to reflect changes.
Merge pull request #640 from pixelmatseriks/workbench/copyContainerFixChildColumn

[BUGFIX] Incorrect placement of child elements on paste and localize into flux column