export should support support entity selection that does not include its parent folders

[bjrmatos]

this allows a different kind of import flow, you can have a whole different organization of folders on some instance (let's say jo, playground, our some custom instance on some server), you want to take from them only one, or some specific entities/peaces, the entities are deeply nested (/my/long/path/template), and you want to replicate just that template at root level in some new jsreport instance (/template), right now the way the export selection works is that it always includes the parent folders of the selected entity, so in the import will replicate the /my/long/path/template hierachy, which may not be desired for this specific case when you only care about insert/update entity in new instance.