Transform nodes using the Transform dialog

[Guillermo Espertino (Gez)]

This was brought by a Blender user, and I think it would be a good idea to have something similar in Inkscape.
In Blender you can use numeric input for transforms (scale, rotate, position). We have a transform dialog in Inkscape, but it only works on objects (shapes, groups), but not in node-edit mode.
We have transform handles for selections in node-edit mode now, but the only way to transform those selections is manually, and it's not possible to apply precise values to those transformations.
Being able to use the Transform dialog in edit mode to apply precise transformations to node selections would solve this problem without adding extra complexity to the UI (actually, the current state is kind of counter-intuitive. The transform dialog is active in node-edit mode but it's applied to the whole shape).