backpack crud : new nested field type displays explicit hiererachy

the world of php CRUD systems -automatic relational database administration interface- is quickly moving forward : last month after weeks of buzz, NOVA  the official crud tool made by PHP framework laravel founder came out, and it really looks nice, we all want to try it but there's small paywall that, even minimal (less than 100$ is nothing for that kind of tool), in the long term process, might stop opensource freaks like me to even try it.

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