fake internode to internode snapping

[Terry-n-brown-users]

Following the "Technical drawing / snapping" thread on the inkscape-user
email list I'd like to make the following suggestion. I think it applies
more to objects being moved than objects being created.

- Find the point on (a path within) the object being moved closest to where
the user clicked.

- Snap that point to the another object, moving the whole object along with
it.

Note that there's no actual node at the point on the moved object closest
to the user's click, it's just a reference position.

This would be a point to path snap as is already implemented in Inkscape,
not the more difficuly line to line snap.

This would allow a line to be placed against a curve... which would be a
tangent if the curve was a circle, but otherwise is just a line touching a
curve. But even so, I don't think there's an easy way to do that
currently?

Cheers -Terry

Original thread starts here:

http://sourceforge.net/mailarchive/forum.php?thread_name=Pine.GSO.4.64.0709
161325140.20474%40amsta&forum_name=inkscape-user